Borax Bead Test (Action of Heat) What happens when Borax is heated strongly on a platinum loop?

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Borax Bead Test (Action of Heat)  What happens when Borax is heated strongly on a platinum loop?

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It first swells due to the loss of water of crystallization, then melts into a clear, transparent glassy bead composed of Sodium Metaborate and Boric Anhydride.   Reaction:  $$Na_2B_4O_7 \cdot 10H_2O \xrightarrow{\Delta} Na_2B_4O_7 \xrightarrow{\Delta} \underbrace{2NaBO_2 + B_2O_3}_{	ext{Transparent Glassy Bead}}$$

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