The opposite of harden is soften.
The opposite of soften is - harden
Soften.
It will harden a stool
no
carbon,
A plastic which will soften when heated and harden when cooled.
'Glue' is too general a term for that question. -What makes some glues soften will make other glues harden. -Please be specific about which 'glue' you mean.
Depends entirely on the glue. some harden in water, some soften or even dissolve.-Name your glue -
A macaroon is actually classed as a cake, because when cakes go stale they harden, but biscuit soften when they go stale!
Cocoa butter can harden due to temperature. If it is hardened, and not just dried out, you can warm it a bit. It should soften back up.
It helps to cool the steel which, if it gets to hot, will soften and loose its edge.