EXHIBIT 4.1


                       8% CONVERTIBLE DEBENTURE

     NEITHER  THESE  SECURITIES  NOR  THE  SECURITIES   ISSUABLE  UPON
     CONVERSION  HEREOF HAVE BEEN  REGISTERED  WITH THE UNITED  STATES
     SECURITIES AND EXCHANGE  COMMISSION OR THE SECURITIES  COMMISSION
     OF ANY STATE  PURSUANT TO AN EXEMPTION  FROM  REGISTRATION  UNDER
     REGULATION D  PROMULGATED  UNDER THE  SECURITIES  ACT OF 1933, AS
     AMENDED (THE "ACT"). THE SECURITIES ARE RESTRICTED AND MAY NOT BE
     OFFERED,  SOLD,  PLEDGED,   TRANSFERRED  OR  ASSIGNED  EXCEPT  AS
     PERMITTED  UNDER THE ACT  PURSUANT TO AN  EFFECTIVE  REGISTRATION
     STATEMENT OR AN EXEMPTION FROM SUCH REGISTRATION REQUIREMENTS.


No.1                                                                US $ 600,000

                            IMSCO TECHNOLOGIES, INC.

                  8% CONVERTIBLE DEBENTURE DUE JANUARY 31, 2002


     THIS  DEBENTURE  is  issued  by IMSCO  TECHNOLOGIES,  INC.,  a  corporation
organized and existing  under the laws of the State of Delaware (the  "Company")
and is designated as its 8% Convertible Debenture Due January 31, 2002.

     FOR VALUE  RECEIVED,  the Company  promises  to pay to AMRO  INTERNATIONAL,
S.A.,  or permitted  assigns (the  "Holder"),  the  principal sum of Six Hundred
Thousand  and 00/100 (US  $600,000)  Dollars on January 31, 2002 (the  "Maturity
Date") and to pay interest on the  principal sum  outstanding  from time to time
quarterly  in  arrears  at the rate of 8% per  annum  accruing  from the date of
initial  issuance.  Accrual of interest shall commence on the first business day
to occur after the date of initial  issuance and continue  until payment in full
of the  principal sum has been made or duly  provided  for.  Quarterly  interest
payments  shall be due and  payable  on July 1,  October 1,  February  1, May 1,
August 1 and  November  1 of each  year,  commencing  with May 1, 1999 or upon a
conversion  of the  debenture  into  Common  Stock as  described  below . If any
interest payment date or the Maturity Date is not a business day in the State of
New York, then such payment shall be made on the next  succeeding  business day.
Subject to the  provisions of Paragraph 4 below,  the interest on this Debenture
is payable at the option of the Company, in cash or in shares of Common Stock of
the Company  ("Common Stock") valued at the Conversion Price (as defined herein)
on the interest  payment  date,  at the address last  appearing on the Debenture
Register  of the  Company as  designated  in writing by the Holder  from time to
time. The Company will pay the principal of and any accrued but unpaid  interest
due upon this Debenture on the Maturity Date,  less any amounts  required by law
to be deducted,  to the registered  holder of this Debenture as of the tenth day
prior to the  Maturity  Date and  addressed  to such holder at the last  address
appearing on the Debenture  Register.  The forwarding of the required  number of
shares of Common  Stock  determined  pursuant to the  provisions  of Paragraph 4
below, shall constitute a payment of principal and interest





hereunder  and shall  satisfy and  discharge  the  liability  for  principal and
interest  on  this  Debenture  to the  extent  of  the  sum  represented  by the
equivalent  Conversion Price value of such shares of Common Stock (as defined in
Paragraph 3 below) plus any amounts so deducted.

     This Debenture is subject to the following additional provisions:

     1. The Company shall be entitled to withhold from all payments of principal
of, and interest on, this  Debenture any amounts  required to be withheld  under
the  applicable  provisions  of the  United  States  income  tax  laws or  other
applicable  laws at the time of such  payments,  and Holder  shall  execute  and
deliver all required documentation in connection therewith.

     2. This Debenture has been issued subject to investment  representations of
the  original  purchaser  hereof and may be  transferred  or  exchanged  only in
compliance  with the Securities  Act of 1933, as amended (the "Act"),  and other
applicable  state and  foreign  securities  laws.  In the event of any  proposed
transfer of this Debenture,  the Company may require, prior to issuance of a new
Debenture in the name of such other person,  that it receive reasonable transfer
documentation  including a legal  opinion that the issuance of the  Debenture in
such  other  name  does  not and will not  cause a  violation  of the Act or any
applicable  state securities laws. Prior to due presentment for transfer of this
Debenture,  the  Company  and any agent of the  Company  may treat the person in
whose name this Debenture is duly registered on the Company's Debenture Register
as the owner hereof for the purpose of receiving  payment as herein provided and
for all other  purposes,  whether or not this Debenture be overdue,  and neither
the Company nor any such agent shall be affected by notice to the contrary. This
Debenture has been executed and delivered  pursuant to the Debenture and Warrant
Purchase  Agreement  dated as of  February  3, 1999  between the Company and the
original  Holder  (the  "Purchase  Agreement"),  and is subject to the terms and
conditions of the Purchase Agreement, which are, by this reference, incorporated
herein and made a part hereof.  Capitalized terms used and not otherwise defined
herein  shall  have  the  meanings  set  forth  for such  terms in the  Purchase
Agreement.  Payments  under  the  Debenture  shall be made to the  Holder at the
address set forth I the Purchase Agreement.

     3. The Holder of this Debenture is entitled,  at its option,  to convert at
any time commencing on the date hereof,  the principal  amount of this Debenture
or any portion thereof, together with accrued but unpaid interest, provided that
the portion of the principal  amount so converted is Five  Thousand  Dollars (US
$5,000) or a multiple thereof (unless if at the time of such election to convert
the  aggregate  principal  amount of this  Debenture is less than Five  Thousand
Dollars (US $5,000),  then the whole amount thereof) into shares of Common Stock
of the Company  ("Conversion  Shares") at a  conversion  price for each share of
Common  Stock  ("Conversion  Price")  equal  to 75% of the  Market  Price at the
Conversion  Date (as  defined in Section 8  hereof),  but in no event  shall the
Conversion  Price be greater than $1.00 per share (adjusted for any Common Stock
dividend, split or reverse split effected after the date of this Debenture). The
term "Market Price" shall have the meaning set forth in the Purchase Agreement.




     4. The entire unpaid balance of this Debenture and accrued interest thereon
outstanding on the Maturity Date hereof shall automatically  convert into Common
Stock at the Conversion Price on the Maturity Date (the "Mandatory Conversion").

     5.  Notwithstanding  the  provisions of the Debenture and Warrant  Purchase
Agreement or of the Warrants, in no event other than upon a Mandatory Conversion
or while there is outstanding a tender offer for any or all of the shares of the
Company's  common stock shall the holder be entitled,  or shall the Company have
the obligation, to convert all or any portion of this Debenture (and the Company
shall not have the right to pay interest on this  Debenture) to the extent that,
after  such  conversion,  the sum of (1) the  number of  shares of Common  Stock
beneficially owned by the Holder and its Affiliates (other than shares of Common
Stock  which may be deemed  beneficially  owned  through  the  ownership  of the
unconverted  portion of the Debentures or unexercised  portion of the Warrants),
and (2) the number of shares of Common Stock issuable upon the conversion of the
Debentures or exercise of the Warrants  with respect to which the  determination
of this  proviso is being made,  would  result in  beneficial  ownership  by the
Holder and its affiliates of more than 9.99% of the outstanding shares of Common
Stock (after taking into account the shares to be issued to the Holder upon such
conversion or exercise).  For purposes of the  immediately  preceding  sentence,
beneficial ownership shall be determined in accordance with Section 13(d) of the
Securities  Exchange  Act of 1934,  as amended  (the "1934 Act") and  Regulation
13D-G thereunder,  except as otherwise  provided in clause (1) of such sentence.
The Holder  further  agrees that if the Holder  transfers or assigns any of this
Debenture to a party who or which would not be  considered  an  Affiliate,  such
transfer or assignment  shall be made subject to the  transferee's or assignee's
specific  agreement  to be bound the  provisions  of this  paragraph  as if such
transferee or assignee were a signatory to this Agreement.

     6.  Notwithstanding  anything  to the  contrary  contained  herein,  if the
Company's  shares of Common  Stock  subsequently  become  listed on the New York
Stock Exchange,  the American Stock Exchange,  the NASDAQ National Market System
or the NASDAQ SmallCap  Market,  in the event that a conversion (when aggregated
with  all  prior  conversions  of  portions  of this  Debenture  and  any  other
Convertible  Debenture issued pursuant to the Agreement and all shares of Common
Stock  issuable  upon  exercise of the Warrants  (as defined in the  Agreement))
requires  the  Company to issue a number of shares of Common  Stock  which would
exceed 19.9% of the number of shares of Common Stock issued and  outstanding  on
the date of this  Debenture,  the Company shall issue only such number of shares
of Common  Stock as shall not exceed such limit and shall pay the Holder cash in
the  amount  of the  Market  Price for the  number of shares of Common  Stock in
excess of such  number of shares  into  which  this  Debenture  (or the  portion
thereof then being  converted)  is then  convertible  at the  Conversion  Price,
unless the Company has obtained  shareholder approval for such issuance pursuant
to the rules of the referenced  stock market,  or as otherwise  permitted by the
referenced stock market.

     7. Conversion  shall be effectuated by  surrendering  this Debenture to the
Company  (only  if such  Conversion  will  convert  all  outstanding  principal)
together with the form of conversion  notice  attached  hereto as Exhibit A (the





"Notice of  Conversion"),  executed by the Holder of this  Debenture  evidencing
such  Holder's  intention to convert this  Debenture or a specified  portion (as
above provided) hereof.  The Notice of Conversion may be delivered or telecopied
to the Company, provided that the original Debenture is delivered to the Company
within seven (7) business days thereafter by express  courier.  Interest accrued
or accruing  from the date of issuance to the date of conversion  shall,  at the
option of the  Company,  be paid in cash as set forth  above or in Common  Stock
upon conversion at the Conversion Price on the Conversion Date. No fraction of a
share or scrip  representing a fraction of a share will be issued on conversion,
but the number of shares  issuable  shall be rounded  down to the nearest  whole
share. The date on which Notice of Conversion is given shall be deemed to be the
date on which the Holder faxes the Notice of Conversion  duly  executed,  to the
Company.  Facsimile  delivery of the conversion  notice shall be accepted by the
Company at facsimile number (718) 843-8504, Attn.: Chief Executive Officer.

The term "Conversion Date" means, with respect to any conversion  elected by the
holder  of the  Debenture,  the date  specified  in the  Notice  of  Conversion,
provided  the copy of the Notice of  Conversion  is  telecopied  to or otherwise
delivered to the Company in  accordance  with the  provisions  hereof so that is
received by the Company on or before such specified date.

The Company shall, at its expense,  take all actions and use all means necessary
and  diligent  to  cause  its  transfer   agent  to  deliver  the   certificates
representing  the Converted  Shares  issuable upon  conversion of any Debentures
(together  with  Debentures  not being so  converted)  to the Holder via express
courier,  by electronic  transfer or  otherwise,  within three (3) business days
(such third  business  day, the  "Delivery  Date") after (A) the business day on
which the Company has received both of the Notice of Conversion (by facsimile or
other delivery) and the original Debentures being converted (and if the same are
not  delivered  to the  Company on the same date,  the date of  delivery  of the
second of such  items) or (B) the date an  interest  payment on the  Debentures,
which the  Company  has  elected  to pay by the  issuance  of Common  Stock,  as
contemplated by the Debentures, was due.

The  Company  understands  that a delay in the  issuance of the Shares of Common
Stock beyond the Delivery Date could result in economic  loss to the Holder.  As
compensation  to the  Holder  for such  loss,  the  Company  agrees  to pay late
payments to the Holder for late issuance of Shares upon Conversion in accordance
with the following  schedule  (where "No.  Business Days Late" is defined as the
number of business days beyond two (2) business days from the Delivery Date):


                                      Late Payment For
                                      Each $10,000 Principal of
      No. Business Days Late          Debentures Being Converted
      ----------------------          --------------------------
             1                          $100
             2                          $200
             3                          $300
             4                          $400
             5                          $500
             6                          $600
             7                          $700
             8                          $800
             9                          $900
            10                          $1,000
           >10                          $1,000 + $200 for each Business Day Late
                                        beyond 10 days





The Company shall pay any payments  incurred  under this Section in  immediately
available  funds upon demand.  Nothing  herein shall limit the Holder's right to
pursue actual damages for the Company's  failure to issue and deliver the Common
Stock to the Holder. Furthermore, in addition to any other remedies which may be
available to the Holder,  in the event that the Company  fails for any reason to
effect  delivery of such shares of Common  Stock  within two (2)  business  days
after the  Delivery  Date,  the Holder will be  entitled to revoke the  relevant
Notice  of  Conversion  by  delivering  a notice to such  effect to the  Company
whereupon the Company and the Holder shall each be restored to their  respective
positions immediately prior to delivery of such Notice of Conversion.

If, by the relevant  Delivery  Date, the Company fails for any reason to deliver
the Shares to be issued upon  conversion  of a Debenture and after such Delivery
Date,  the holder of the  Debentures  being  converted (a  "Converting  Holder")
purchases,  in an open market  transaction or otherwise,  shares of Common Stock
(the "Covering  Shares") in order to make delivery in  satisfaction of a sale of
Common Stock by the Converting  Holder (the "Sold Shares"),  which delivery such
Converting  Holder  anticipated  to make using the Shares to be issued upon such
conversion (a  "Buy-In"),  the Company shall pay to the  Converting  Holder,  in
addition  to  all  other  amounts   contemplated  in  other  provisions  of  the
Transaction  Agreements,  and not in lieu thereof,  the Buy-In Adjustment Amount
(as defined below).  The "Buy-In  Adjustment  Amount" is the amount equal to the
excess,  if any, of (x) the Converting  Holder's total purchase price (including
brokerage commissions, if any) for the Covering Shares over (y) the net proceeds
(after brokerage commissions, if any) received by the Converting Holder from the
sale of the Sold Shares.  The Company shall pay the Buy-In  Adjustment Amount to
the  Company in  immediately  available  funds  immediately  upon  demand by the
Converting  Holder.  By  way  of  illustration  and  not  in  limitation  of the
foregoing,  if the Converting  Holder  purchases shares of Common Stock having a
total purchase price  (including  brokerage  commissions)  of $11,000 to cover a
Buy-In  with  respect  to  shares of Common  Stock it sold for net  proceeds  of
$10,000,  the Buy-In  Adjustment Amount which Company will be required to pay to
the Converting Holder will be $1,000.

     8. No provision of this  Debenture  shall alter or impair the obligation of
the Company,  which is absolute and unconditional,  to pay the principal of, and
interest on, this  Debenture at the time,  place,  and rate,  and in the coin or
currency or shares of Common  Stock,  herein  prescribed.  This  Debenture  is a
direct obligation of the Company.

     9. No  recourse  shall be had for the payment of the  principal  of, or the
interest  on, this  Debenture,  or for any claim based  hereon,  or otherwise in
respect hereof,  against any  incorporator,  shareholder,  employee,  officer or
director,  as such,  past,  present or future,  of the Company or any  successor





corporation,  whether by virtue of any constitution,  statute or rule of law, or
by the enforcement of any assessment or penalty or otherwise, all such liability
being, by the acceptance  hereof and as part of the  consideration for the issue
hereof, expressly waived and released.

     10. If the Company merges or consolidates with another corporation or sells
or transfers all or  substantially  all of its assets to another  person and the
holders  of the  Common  Stock are  entitled  to receive  stock,  securities  or
property in respect of or in exchange for Common  Stock,  then as a condition of
such  merger,  consolidation,  sale  or  transfer,  the  Company  and  any  such
successor,  purchaser or transferee  agree that the Debenture may  thereafter be
converted  on the terms and subject to the  conditions  set forth above into the
kind and amount of stock,  securities or property  receivable  upon such merger,
consolidation,  sale or  transfer  by a holder of the number of shares of Common
Stock into which this  Debenture  might have been converted  immediately  before
such merger, consolidation, sale or transfer, subject to adjustments which shall
be as nearly equivalent as may be practicable.

     11. This  Debenture  shall be governed by and construed in accordance  with
the  laws  of the  State  of New  York.  Each  of the  parties  consents  to the
jurisdiction  of the federal  courts whose  districts  encompass any part of the
City of New York or the state  courts of the  State of New York  sitting  in the
City of New York in connection with any dispute arising under this Agreement and
hereby waives, to the maximum extent permitted by law, any objection,  including
any  objection  based on  forum  non  conveniens,  to the  bringing  of any such
proceeding in such jurisdictions.

     12. The following shall constitute an "Event of Default":

          a.   The Company shall default in the payment of principal or interest
               on this  Debenture  and same shall  continue for a period of five
               (5) days; or

          b.   Any of the  representations  or  warranties  made by the  Company
               herein,  in  the  Purchase  Agreement,  the  Registration  Rights
               Agreement, or in any agreement, certificate or financial or other
               written  statements  heretofore  or  hereafter  furnished  by the
               Company in  connection  with the  execution  and delivery of this
               Debenture or the Purchase  Agreement shall be false or misleading
               in any material respect at the time made; or

          c.   The Company  fails to issue  shares of Common Stock to the Holder
               or to cause its  Transfer  Agent to issue  shares of Common Stock
               upon  exercise  by the  Holder  of the  conversion  rights of the
               Holder in accordance with the terms of this  Debenture,  fails to
               transfer  or  to  cause  its  Transfer   Agent  to  transfer  any
               certificate  for shares of Common Stock issued to the Holder upon
               conversion  of  this  Debenture  as and  when  required  by  this
               Debenture or the Registration Rights Agreement,





               and such  transfer is  otherwise  lawful,  or fails to remove any
               restrictive legend or to cause its Transfer Agent to transfer any
               certificate  or any shares of Common  Stock  issued to the Holder
               upon  conversion  of this  Debenture as and when required by this
               Debenture,  the  Purchase  Agreement or the  Registration  Rights
               Agreement and such legend  removal is otherwise  lawful,  and any
               such failure shall  continue  uncured for five (5) business days;
               or

          d.   The  Company  shall fail to perform or observe,  in any  material
               respect,  any  other  covenant,   term,   provision,   condition,
               agreement  or  obligation  of  the  Company  under  the  Purchase
               Agreement,  the  Registration  Rights Agreement or this Debenture
               and such failure  shall  continue  uncured for a period of thirty
               (30) days after  written  notice from the Holder of such failure;
               or

          e.   The Company  shall (1) admit in writing its  inability to pay its
               debts  generally as they mature;  (2) make an assignment  for the
               benefit of creditors or commence proceedings for its dissolution;
               or (3) apply for or  consent  to the  appointment  of a  trustee,
               liquidator or receiver for its or for a  substantial  part of its
               property or business; or

          f.   A trustee,  liquidator  or receiver  shall be  appointed  for the
               Company or for a  substantial  part of its  property  or business
               without its consent and shall not be discharged within sixty (60)
               days after such appointment; or

          g.   Any governmental agency or any court of competent jurisdiction at
               the instance of any  governmental  agency shall assume custody or
               control of the whole or any substantial portion of the properties
               or assets of the Company and shall not be dismissed  within sixty
               (60) days thereafter; or

          h.   Any money  judgment,  writ or warrant of  attachment,  or similar
               process  in excess of One  Million  ($1,000,000)  Dollars  in the
               aggregate shall be entered or filed against the Company or any of
               its   properties  or  other  assets  and  shall  remain   unpaid,
               unvacated,  unbonded or unstayed  for a period of sixty (60) days
               (or such  later  period  for  payment  as any such  judgment  may
               specify)  or in any event  later  than five (5) days prior to the
               date of any proposed sale thereunder; or

          i.   Bankruptcy, reorganization, insolvency or liquidation proceedings
               or other  proceedings  for relief under any bankruptcy law or any
               law for the relief of debtors  shall be  instituted by or against
               the Company and, if





               instituted  against the Company,  shall not be  dismissed  within
               sixty (60) days after such  institution  or the Company  shall by
               any action or answer  approve of, consent to, or acquiesce in any
               such proceedings or admit the material allegations of, or default
               in answering a petition filed in any such proceeding; or

          j.   The Company  shall have its Common  Stock  suspended  or delisted
               from trading on an exchange or the NASD OTC Bulletin Board market
               for in excess of two Trading Days;

Then, or at any time  thereafter,  and in each and every such case,  unless such
Event of Default  shall have been waived in writing by the Holder  (which waiver
shall not be deemed to be a waiver of any  subsequent  default) at the option of
the Holder and in the Holder's  sole  discretion,  the Holder may consider  this
Debenture immediately due and payable,  without presentment,  demand, protest or
notice of any kind, all of which are hereby expressly waived, anything herein or
in any note or other instruments contained to the contrary notwithstanding,  and
the  Holder  may  immediately  enforce  any and all of the  Holder's  rights and
remedies  provided  herein or any  other  rights or  remedies  afforded  by law;
provided,  that any payment of this  Debenture  in  connection  with an Event of
Default (other than a delisting of its Common Stock pursuant to clause (j.)) may
be made, at the  Company's  election,  in cash or in shares of Common Stock,  in
such number as would be issued at the Conversion Price on the date the Debenture
becomes due and  payable. 

13. Nothing  contained in this Debenture  shall be construed as conferring  upon
the Holder the right to vote or to  receive  dividends  or to consent or receive
notice as a shareholder in respect of any meeting of  shareholders or any rights
whatsoever as a shareholder of the Company,  unless and to the extent  converted
in accordance with the terms hereof.


     IN WITNESS  WHEREOF,  the  Company has caused  this  instrument  to be duly
executed by an officer thereunto duly authorized.


Dated:   February 4, 1999

                                       IMSCO TECHNOLOGIES, INC.



                                       By:   /s/Alexander T. Hoffmann
                                       -----------------------------------
                                       Chairman and Chief Executive Officer






                                    EXHIBIT A

                              NOTICE OF CONVERSION*

   (To be Executed by the Registered Holder in order to Convert the Debenture)

                  The  undersigned   hereby  irrevocably  elects  to  convert  $
________________  of the  principal  amount of the above  Debenture No. ___ into
Shares of Common Stock of IMSCO TECHNOLOGIES,  INC. (the "Company") according to
the conditions hereof, as of the date written below.


Date of Conversion ____________________________________________________________


Applicable Conversion Price  ___________________________________________________


Accrued Interest through Date of Conversion $__________________.

Number of Shares to be Issued: ___________________


Signature_____________________________________________________________________
                                  [Name]

Address:______________________________________________________________________

        ______________________________________________________________________


* This Notice of  Conversion  must be received by the Company via  facsimile  in
order to effectuate the conversion,  with the original Debenture being delivered
to the Company within seven business days thereafter by express courier.