Question

What are dye stuffs for example methylene blue

Answer 1

A dye is a colored substance that has an affinity to the substrate to which it is being applied. The dye is generally applied in an aqueous solution.
Simply the gel like substance which mix with water and used for colouring hair.Depending on the chemical content of dye it's colour varries.
Examples:

• Basic fuchsin
• Acid fuchsin
• Crystal violet
• Aniline blue
• Toluidine blue