Weber Scientific® L-W Stain For Milk Smears - Tetrachloroethane

All available formulations conform to APHA, Standard Methods for the Examination of Dairy Products. The stain is made in four formulations: Regular tetrachloroethane or xylene, and Canadian tetrachloroethane or xylene. There are several differences. Both contain certified methylene blue dye while the Canadian stain contains some red basic fuchsia dye which gives the smear a pinkish background. Use is fairly evenly split between the two based upon user preference. The xylene stain is generally recommended since it’s somewhat less toxic than tetrachloroethane.