Solvents can be dangerous and harmful unless they are handled correctly.

All evaporation should be done outdoors on a day when there is a breeze or light wind to dispel the vapors and prevent pooling, there is a very real danger of explosion or fire so caution is required at all times!

Naphtha is a hydrocarbon, i.e., a component of natural gas condensate or a distillation product from petroleum, it is a colorless to reddish-brown volatile aromatic liquid, very similar to gasoline.

Forms of naphtha may be carcinogenic, and frequently products sold as naphtha contain some impurities which may also have harmful properties of their own.[7][8] Like many hydrocarbon products, they are products of a refining process in which a complex soup of chemicals is broken into another range of chemicals, which are then graded and isolated mainly by their specific gravity and volatility. There is, therefore, a range of distinct chemicals included in each product. This makes rigorous comparisons and identification of specific carcinogens difficult, especially in our modern environment where people are daily exposed to many such products, and is further complicated by exposure to a significant range of other known and potential carcinogens.[9]