With high quality, Rotring Refills White 23ml Bottled Ink is uniquely made to enhance your artistic creations. These colored inks can be mixed with one another to suit your design needs without affecting the resulting color's ink quality.Suitable for tracing paper, vellum drawing paper and lineboard. Smudge-proof when dry and waterproof.Not erasable with Rotring pencil erasers B20 or B30 lightfast.Not suitable for tattoo usage.23ml bottled White Ink.