Answer: anneals

AnswerCrossword Clue
ANNEALSTempers, in a way
ANNEALSTempers
ANNEALSStrengthens, as steel
ANNEALSPrepares earthenware, in a way
ANNEALSToughens
ANNEALSTempers steel by heating and cooling.
ANNEALSTempers metal.
ANNEALSStrengthens and tempers.
ANNEALSHeats, as glass, to fix colors.
ANNEALSTempers.
ANNEALSTempers with heat.
ANNEALSHeats, as glass
ANNEALSToughens, as metal
ANNEALSTreats steel
annealsANNEAL, to toughen (to make tough (strong and resilient))
annealsto toughen or temper (metal or glass)