Contents Of Air Activated Heat Patches - Is It Toxic If Taken Out Of Patch?'

[joko]

I have some used heat patches the type that are in a plastic bag, then you take them out, peel off some paper & stick them on.

Is the black powder inside these toxic to breathe or touch etc?

I was thinking of using it in an art project but obviously need to be safe.

Thanks for any help :) 

[Alagopus]

Doesn't appear to be:

lngredients: Activated carbon, Iron powder, Vermiculite, water, sodium chloride
Air-activated hand warmers contain cellulose, iron powder, activated carbon, vermiculite (which holds water) and salt. They produce heat from the exothermic oxidation of iron when exposed to air. The oxygen molecules in the air, together with the water, react with iron, forming rust (which is a hydrated oxide of iron). Salt is usually added to catalyze the process.
Ref. Wikipedia

[Alagopus]

Black powder is activated charcoal/carbon.