Methylene Blue 1% (w/v) & Eosin Y 0.5% (w/v) Aqueous Solution 2-Pack This combo pack Ready to Use is very useful for any laboratory as Eosin Y is a counter stain to Methylene Blue. Eosin Y is commonly used as a red stain for emphasizing red blood cells, cytoplasmic material, cell membranes, and extracellular structures. Methylene Blue 1% aqueous solution is commonly used to stain animal cells to make the nuclei more visible. Accurate Weatherproof labels Plastic Bottle for Handling Safety FREE Droppers Not for Human or Drug use Research purpose only