Waterproof Pens - drawing pens for outlining watercolours

Waterproof drawing pens perfect for allowing you to sketch or outline your work and then add colour or tints
Waterproof drawing pens allow you to sketch or outline your work and then add colour or tints using anything from watercolour paint through to alchol-based marker pens without the lines smudging or running.The key ingedient is pgment ink, which contains tiny particles of colour that bind tightl

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