Staedtler Lumocolor permanent special F 319 F-9 Permanent marker Black waterproof: Yes

Responsible for many special applications such as coated surfaces, nano coatings, optical glass, laboratory glass, etc. Adheres to many specific surfaces on which other fine markers do not stick. Excellent smudge-proof and waterproof qualities on almost all surfaces. Dries in seconds, therefore ideal for left-handers.

Price: £ 2.29 from Conrad Electronic