lol. read the msds of any solvent.
acetone, is a ketone, which is liquid at room temp. acetone is not a diluted solution. it is one chemical. and since it both has a smell, no industrial identification trace chems need to be added. the blue and yellow can at wall to wall mart is 100%.
Now as acetone is a volatile liquid, it evaporates totally out of the finished product. unless you use nail polish or a strange adulterated brand of acetone(both being toxic), you can pour it onto glass, let it evap and there will be nothing left(maybe a gathering of already present dirt).
When doing AB/ACB extractions, often people(Read: people in the tubes) say to use naphtha as your polar solvent. this is bad because naphtha is a gross mixture of various petroleum distillates, all with unique boiling/evaporation properties. Naphtha is also often adulterated with industry markers and chemicals. if you plan on using a polar, id either make/buy chloroform and use it correctly, or find a way to make a different polar work. if you have the Tek and patience, you can do acid/base titration and end up with a perfect product. but burrettes are expensive and not toke&grow friendly.i derived crystalline and blotter viable sally using these techniques from dried foliage and my product was clean.
TL/DR: Acetone is a clean and safe solvent when produced by a reputable manufacturer. naphtha sucks.