Samples are dissolved or suspended in a `` cocktail '' containing a solvent ( historically aromatic organics such as benzene or toluene , but more recently less hazardous solvents are used ) , typically some form of a surfactant , and small amounts of other additives known as `` fluors '' or scintillators .
The `` cocktail '' is containing an aromatic solvent and small amounts of other additives known as fluors .