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Currently I am working on a chemistry project about hand warmers. My goal is to find a salt hydrate which gets warmer than sodium acetate trihydrate and can supercool. I already bought magnesium nitrate hexahydrate and aluminium ammonium sulfate dodecahydrate. I have tried to supercool them but they always crystallised so far.

Do you know if it is possible to supercool them? Can I mix two of the mentioned salt hydrates? For example, sodium acetate trihydrate and magnesium nitrate hexahydrate?

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    $\begingroup$ Have you tried pentahydrate of sodium thiosulfate ? It was used frequently in past as the main component of fixing solution in B/W photography. In my experience, it supercooled easily and was not too sensitive until seed was introduced. $\endgroup$
    – Poutnik
    Feb 16 at 18:16
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    $\begingroup$ And it makes spiffy crystals when viewed under crossed polarizers! travishale.com/sodium-thiosulfate-polarized-light-microscopy You might even include your own photos in your project $\endgroup$
    – DrMoishe Pippik
    Feb 16 at 19:20

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