OrphicTrench
Bluelighter
Normally, it is salt. It should be mentioned otherwise. The best way to know is asking your guy. 
On the streets, yes. But for someone who doesn't want to bother about diluting and accurate measuring, I don't see a big problem. It's just an easy way to keep a single dose separate and solid.
I see where the problems can be, but the price of blotters on those manufacturing it is quite expensive, and I think that anyone getting serious about their research would still stick to the too-good-reliable liquid form.

I find it disconcerting that this is being sold on blotter
On the streets, yes. But for someone who doesn't want to bother about diluting and accurate measuring, I don't see a big problem. It's just an easy way to keep a single dose separate and solid.
I see where the problems can be, but the price of blotters on those manufacturing it is quite expensive, and I think that anyone getting serious about their research would still stick to the too-good-reliable liquid form.