Isomars Technoart Technical Drawing Pen Ink Combo - set of 9 Contains nine colours : *Violet *Orange *Lemon Yellow *Yellow *Green *Brown *Red *Black and Blue The ink has good adhesion and is waterproof. Suitable for tracing paper, vellum, drawing paper and line board.It's lightfast and suitable for all forms of reproduction. Ink has high color purity. Colored inks can be mixed with one another.