Evidence has shown some biological dyes to be mutagenic, identifying mutagens are crucial since cancer is directly linked to mutations. Minimising exposure is one approach in reducing risk and preventing cancer. This paper aims to determine mutagenicity of five commonly used dyes (silver nitrate, safranin, acid fuchsin, methyl green and crystal violet). The mutagenic potential was achieved by exposing mutant strain of S. typhimurium (TA1535) (his -) to dyes of 0.25 mg/ml on minimal media plates via in vitro the Ames assay. The Ames test is a reliable initial screening for pharmaceuticals and...