Dye ink dries waterproof, so it's perfect for use with stamps you want to colour with markers or coloured pencils. Fast drying, permanent, non-toxic, archival quality, and perfect for watercoloring. This package contains (1) 0.5 fl. ounce/14mL refill bottle of Archival Dye Ink. Available in a variety of colours, each sold separately. Conforms to ASTM D4236.