Definitions for "Hardeners"
(or catalysts)-The chemicals added to paint that make the paint harden as opposed to drying. These chemicals usually contain isocyanates.
Are chemicals often used with a fixing bath to strengthen the physical characteristics of an emulsion. The most common hardeners are potassium or chrome alum.
Substance or mixture of substances added to a resin to promote or control the curing reaction by taking part in it. Syn. Crosslinking agent, Curing agent