I think all elements in the powder toy should "want" to return to the temperature it was created at like water once heated would want to cool (by itself) back to 20 C, just like it would in real life
well why dont they speed it up. everything else is accelerated in the powder toy, so speed up the cooling process too, because i get tired of fuel pre igniting because the surface is hot.
i have a solution make antifreeze high boiling point, because water and salt water boil at too low of a temperature. antifreeze would not freeze and would boil at ~400 C and its heat conductivity would be really high
if you absolutely, positively need to cool something quickly after heating it, even if it is only like 200-300 C your best bet is CLNE and water. Doesn't do much to actively cool but steam cooling will drop the temperature incredibly fast after the heat source leaves.