Boric acid flakes are hygroscopic or devitrified?

22 September 2019 0 10K Report

when powdered boric acid (dry) is heated to stove-top temperature, it melts into a viscous bubbling liquid. when the melt is frozen, transparent flakes of solidified boric acid is obtained. But if the flakes are left in room temperature in open air for a day or two, the flakes become opaque. Boric acid has quite low melting point. so, does it become opaque by devitrification, or by absorbing moisture?

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