Purity - Acetone wash...lost 70% OUCH!

[patygarc]

SWIM has been reading about purification processes and has sucessfully performed a bunch of them. Mostly, he makes crack and recrystalizes it. However, SWIM told me that the other day he was lazy and just did an acetone wash and mentioned that he lost almost 70% of product. The end result was a clear crystaline powder, but what lay at the bottom of the beaker once the acetone evaporated was a yellowish oily substance.

SWIM has trusted his source for years now, and his source told him that it was top of the line shit. Apparently not!! SWIM decided to not waste the product and use it straight, but has found out that it just freaks him out. SWIM thinks its some sort of other "caine" or amphetamine what the product has been cut with.

SWIM wants to use the nasal spray method for ease of use. What do youu guys think? What is that yellowish residue?