Edding 750 (e)

For permanent marking even on dark and transparent materials such as metal, glass, and plastic. Waterproof and heat resistant up to 400 °C, varnish-like opaque, low odor, and extremely light resistant. The colors yellow, white, silver, orange, brown, purple, pink, and light blue are visible up to 1000 °C. Shake the pen vigorously with the cap closed, then open it, apply the pen tip to a piece of test paper, and carefully pump up and down.