Methylene blue is a salt used for different purposes, for scientific, research and analytical applications, as a dye, etc... Directions: Mix 0.2ml (4 drops) of the solution with 200ml of water, or use according to your established research protocols. Warning: May cause skin, respiratory and eye irritation. Wash hands thoroughly after handling. Wear protective gloves/ protective clothing/eye protection/face protection. If on eye/skin wash with plenty of water. The choice of the process used and the usage is the sole responsibility of the user. This product is not intended to diagnose, cure or prevent any disease. Keep out of reach of children. Keep tightly closed in a dark, well ventilated area. Methylene blue is a highly potent dye and can cause significant staining.