You can count on the performance of these stains formulated from top-grade, certified raw materials that have been tested to meet the industry's highest standards. Finished-good testing involved analytical, qualitative and quantitative analysis to ensure quality, longevity, and lot-to-lot consistency. All stain products are ready-to-use and require no dilution. StatLab's family of cytology stains will give you optimal results when used together under the recommended guidelines.