.5oz Re-Inkers for the custom four-cell ink palette. Each Re-Inker contains the Archival Ink formulation for long lasting results. They are permanent on many surfaces and won't bleed when used with water-based inks, markers, acrylic paint, alcohol ink and more. Available in a variety of colors, each sold separately. Ink is acid free, permanent and waterproof. Conforms to ASTM D 4236.