Uni POSCA PC-7M Paint Marker Art Pen - Large Bullet Nib - Buy 4, Pay for 3
The Uni POSCA is also permanent and bleed-proof on paper and card (as it absorbs into the fibres), and can be made permanent on the following Uni POSCA PC-7M Paint Marker Art Pen - Large Bullet Nib - All 15 Colours Available.