Wikipedia: Heating glycerol above 280C will cause it to decompose into acrolein, a toxin.

Me: But what if I heated it above 3000C and it was next to metalic magnesium and hydrogen gas?

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Eternal Flower:

How does Wilardo preserve the flowers?

Most likely he uses the glycerin (glycerol) dehydration technique. This is based on passing the flowers through a gradient of increasing concentrations of glycerol (and other things).

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Snow flies (Chionea) are crane flies (Tipulomorpha) that active during winter, as their body fluid contain glycerol to prevent them from freezing. They are almost wingless, and the space which originally housed by flight muscles are instead use to store their eggs.

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