What is an antonym for Clay?

What is the opposite of clay?
friablebreakable
crumblyfragile

What is another name for plasticine?

•modeling clay (noun)

clay, sculptor’s wax, plasticine [tm], play-doh [tm].

What is an antonym for Paste?

What is the opposite of paste?
unstickdetach
loosenunfasten
separatefree
removedisengage
disconnectsever

What is the opposite of gravestone?

What is the opposite of grave?
harmlessinnocent
innocuouslight
nonhazardousnonthreatening
safetrivial
unseriousunthreatening