http://www.atsdr.cdc.gov/toxprofiles/tp21.pdf
TL;DR: It can be toxic, generally, but whether you'll experience any effects following exposure depends on how much you use, how often you use it, the type/route of exposure (e.g., inhalation, dermal, oral), the environment you use it in, and your level of internal toxicity/state of health/etc. In short, it's no different than anything else.
Brian
When I talked to here about acetone in the workplace, my sister the beautician said that
1. She knew of no adverse health effects from breathing it at the
salon for years, at low concentrations.
2. No ventilation of its fumes was done at her workplace.
3. The only workplace precaution regarding acetone was that NOT
more than one gallon of it was allowed to be in the salon at a time.
Hence, I will not hesitate to experiment using the acetone/methanol mixture indoors w/ closed windows. However, I will first get a sealed tin to store the flammable chemicals in when not in use, and a pair of chemical safety goggles.
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