anneal
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Annealing (heating and allowing to slowly cool) softens metals. Copper may be "work hardened" by squeezing it, hammering it, shot blasting it. A limited amount of hardening may be obtained by heat treating it- heating, followed by rapid cooling, usually by quenching in liquid.
Like most metals, copper is softened by gradually heating it without melting it.
soften
by adding gray
It will soften, melt and burn
CuSO4 copper sulfateCuSO3 copper sulfiteCuS copper sulfideCuSO unknown, rather impossible copper-sulfur compound
There are many e.g. CuO, CuCO3 CuSO4 and Copper Phthalocyanine which is an important blue pigment used in blue paints and inks.
The opposite of soften is - harden
No, the word soften is a verb (soften, softens, softening, softened); to make something soft. Noun forms for the verb to soften are softener, an agent used to soften; and the gerund softening, the act of making soft.
The past tense of soften is softened.
Mainly to prevent wrinkling and soften clothes
simplySmart lotion soften
Bones soften sometimes not all the time.
This soap will really soften your hands
To soften the pillow we wash it lots of times.
The recipe called for me to soften the butter in the microwave.
The noun forms for the verb to soften are softener and the gerund, softening.
Thawing a frozen turkey will soften it.
Solids soften because they may be made with different materials, if possible.