1 EXHIBIT 23. CONSENT OF INDEPENDENT ACCOUNTANTS. We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 33-37279) of Hercules Incorporated of our report dated June 22, 1999 relating to the financial statements, which appears in this Form 11-K. /s/ PricewaterhouseCoopers LLP Philadelphia, Pennsylvania June 29, 1999