2.2. Method
Two formulations A and B were prepared. For formulation A,
a suspension of 5.0 g of basic zinc carbonate in 75 ml distilled
water, 100 mg basic fuchsin dye and 0.3 ml commercial liquid
detergent was added. Formulation B was prepared by adding
100 mg crystal violet to a suspension of 5.0 g of basic zinc carbonate
in 75 ml distilled water followed by 0.3 ml of commercial
liquid detergent. About 200 ml of clean water was taken in
separate containers, so as to simulate conditions of a suspected
weapon recovered, from a flowing river or a stagnant pool of