Hardener
[hahr-dn-er] /ˈhɑr dn ər/
noun
1.
a person or thing that .
2.
a substance mixed with paint or other protective covering to make the finish harder or more durable.
3.
Photography. a chemical used to raise the melting point of an emulsion.
/ˈhɑːdənə/
noun
1.
a person or thing that hardens
2.
a substance added to paint or varnish to increase durability
3.
an ingredient of certain adhesives and synthetic resins that accelerates or promotes setting
n.
1610s, from harden + -er (1).
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