Hmm. Biohazard symbol. Found in a mine. Sounds a little shady, to me (don't you think?). I'd avoid it until I could handle it in a hood (preferably
laminar flow with a HEPA) and proper PPE. I'd treat any unknown very carefully, as if it could bite. An unknown with that symbol...doubly so.
However, what you describe, and the name "starchest," or whatever, suggests it might be starch. This can be easily tested with tincture of iodine or
with KI/peroxide. I should caution you, though, that starch has been used as a carrier for much nastier things.
Careful,
O3 |