Commonly Used Chemicals
The most common laboratory solvent sequence is trichloroethylene (TCE), acetone, methanol, and deionized water. Note that in particular trichloroethylene is a known carcinogen, and should be handled with extra caution. Some individuals are sensitive to darkroom chemicals (developer, fixer, stop bath), resulting in contact dermatitis. Tongs should be used to move photographic paper through these chemicals.