- Testforstrongest,untwistandsplitimpatientoftheferro-concreteproducts.Thesevoltagesmakethecrystalsuntwistinvaryingdegreestofilterlightintovaryingshadesofcolor.Itmaythenbebentorcrumpled,butonreheating,willviolentlyuntwist,reformingitsoriginalshape.Allo...
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