If the pictures are true to the situation, the concentrations are tiny. You can look up videos of people putting less than a teaspoon into water to get the same result.

IIRC, PP can be a precursor to chlorine. But, you're comparing two different chemicals here and what applies to one likely doesn't apply to another.

There is a chance your skin will feel like it's burning if it's not fully dissolved in water. I wouldn't advise touching the dry powder. The shards will embed into your skin and it will feel like an open wound filled with Tabasco for a long time.

Fun-fact: If you mix it with glycerol it combusts, so don't use any lotions with it if you get some on your skin.

ETA: I don't know what's going on, but there's a lot of low-effort responses in this thread. Is it the hours?