Methylene blue
Alkaline, dark blue dye in aqueous solution. Is often used in the aquarium hobby as a mild fungicide, also used to prevent spawn fungus. However, it is also used in small quantities as a colourant in various preparations.
Alkaline, dark blue dye in aqueous solution. Is often used in the aquarium hobby as a mild fungicide, also used to prevent spawn fungus. However, it is also used in small quantities as a colourant in various preparations.