Comment on making rubies in a microwave oven
How To Make Ruby in a Microwave at https://www.youtube.com/watch?v=ybcdRQmQcHQ It looks like the aluminum wire is burning (oxidizing) to aluminum oxide, and melting some of the close mixture. If you use coarse grained aluminum powder, and mix with the oxides, it might work longer and more uniformly. The melting point of aluminum oxide is 2072
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