[ARTICLE]                  5
[LEGEND]
This schedule contains the Guaranty dated November 25, 1996 by Industrial 
Services Technologies, Inc. and for the benefit of Carylyn K. Bell.


	GUARANTY

THIS GUARANTY is made effective as of the 25th day of November, 1996 
by Industrial Services Technologies, Inc., a Colorado corporation (the 
"Guarantor"), having its principal place of business and mailing address at 
370 17th Street, Suite 2300, Denver, Colorado  80202 to and for the benefit 
of Carylyn K. Bell, a Colorado resident ("Lender") having an address at 2750 
East Cedar Avenue, Denver, Colorado 80209.  

	RECITALS

     A.  Lender has contemporaneously herewith entered into a Loan Agreement 
(the "Loan Agreement") with Advanced Environmental Systems, Inc., a New York 
corporation ("Borrower"), pursuant to which Lender has agreed, among other 
things, to make a secured loan to Borrower in the original principal amount 
of $425,000 (the "Loan") on the terms and conditions set forth in the Loan 
Agreement.

     B.  It is a condition to the consummation of the transactions 
contemplated in the Loan Agreement that Guarantor execute and deliver this 
Guaranty to Lender.

     C.  Guarantor, as a principal stockholder of Borrower, will be directly 
benefitted by the Loan and desires to execute and deliver this Guaranty to 
Lender.

NOW, THEREFORE, in consideration of the Recitals and other good and valuable 
consideration, the receipt and sufficiency of which is hereby acknowledged, 
Guarantor hereby covenants and agrees as follows:

    1.  Guarantor hereby unconditionally and irrevocably guarantees the 
payment in full of any and all obligations of Borrower to Lender now or 
hereafter arising pursuant to the Loan Agreement (collectively, the 
"Obligations").  Guarantor hereby acknowledges that the Guaranty is a 
guarantee of payment and not of collection and that Lender shall not be 
required, as a condition precedent to making a demand upon the Guarantor or 
to bringing an action against the Guarantor under this Guaranty, to make a 
demand upon, or institute any action or proceeding, at law or in equity 
against Borrower or anyone else, or to exhaust its remedies against Borrower 
or anyone else, or against any collateral security.  All remedies afforded to 
Lender by reason of this Guaranty are separate and cumulative remedies and 
Guarantor agrees and acknowledges that none of such remedies, whether 
exercised by Lender or not, shall be deemed to be exclusive of any other 
remedies available to Lender and shall not limit or prejudice any other 
remedy which Lender may have against any party, including the Guarantor.  

     2.  Guarantor shall remain liable on this Guaranty notwithstanding any 
change or changes in the terms, covenants or agreements of the Loan 
Agreement, or any amendment thereto, hereafter made or granted, or any delay 
on the part of Lender in exercising her rights hereunder or thereunder, it 
being the intention hereof that the Guarantor shall remain liable until the 
full amount of the Obligations secured hereunder and any sums which may due 
thereon, shall have been fully paid, notwithstanding any act or omission 
which might otherwise operate as a legal or equitable discharge of the 
Guarantor.

		  3.	Guarantor hereby waives:

       			a.	Notice of acceptance of this Guaranty;

          b.  Presentment and demand for payment of the obligations or any 
portion thereof;

          c.  Protest and notice of dishonor or default to the Guarantor or 
to any other person or party with respect to the Obligations or any portion 
thereof;

       			d.	All other notices to which the Guarantor might otherwise be 
entitled;

       			e.	Any demand for payment or performance of this Guaranty; and

          f.  All guaranty and suretyship defenses or other defenses in the 
nature thereof.
		
     4.  This Guaranty shall inure to the benefit of, and be enforceable by 
Lender and her successors or assigns, and shall be binding upon and 
enforceable against the Guarantor and its successors or assigns.

     5.  Guarantor agrees that in the event this Guaranty is placed in the 
hands of an attorney for enforcement, Guarantor will reimburse Lender for all
reasonable expenses incurred, including reasonable attorneys' fees, in the 
enforcement hereof.

     6.  This Guaranty cannot be modified or amended except in writing duly 
executed by Guarantor and Lender and shall be construed according to Colorado
law.  

     7.  If any provision of this Guaranty is deemed to be invalid by reason 
of the operation of any law or by reason by the interpretation placed thereon
by any court, this Guaranty shall be construed as not containing such 
provision and the invalidity of such provision shall not affect the validity 
of any other provision hereof and any and all provisions hereof which 
otherwise are lawful and valid shall remain in full force and effect.

IN WITNESS WHEREOF, the undersigned has caused this Guaranty to be executed 
as of the date and year first above written.

					INDUSTRIAL SERVICES TECHNOLOGIES, INC., a Colorado corporation


						By: /s/ Gary L. Schmitt
							Gary L. Schmitt, President