L-W Stain for Milk Smears

Developed in our own laboratories for effective direct microscopic counts of somatic cells and bacteria

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.

Products so identified must ship as hazardous materials (HAZMAT). We welcome you to contact our Customer Service department for additional details about HAZMAT shipping requirements and surcharge fees. In general, HAZMAT fees apply whenever shipped by either UPS or FedEx, currently $44.00 per shipping carton for ground shipment. Air shipments require a $130.00 fee. To avoid most HAZMAT fees, if your order contains hazardous materials that require four or more shipping cartons, we will route via common carrier, which may not have any, or have greatly reduced, HAZMAT fees. Additionally, some products identified as HAZMAT may qualify for “Limited Quantity” regulations, eliminating the need for HAZMAT fees. HAZMAT orders are exempted from our 1-2-3 Day Delivery Program.

• 2001-05,25,2002-05,25-tetra-sds.pdf
• 2001-00,20 2002-00,20-xylene-sds.pdf
• L-W Staining Procedure
• L-W Stain Technique Memo