EXHIBIT 10.23 AMENDMENT TO AGREEMENT WHEREAS, CheMatch.com, Inc. (formerly known as PetroChemNet Holdings, Inc.), hereinafter "PCN, CheMatch, or the Company" and E.I. duPont de Nemours and Company, hereinafter "DuPont", entered into a certain...Chematch Com Inc • May 17th, 2000 • Services-business services, nec
