Colour Artist Dye InkFor use on paper, cardstock, plastic, metal, wood, chipboard and other surfaces. Great for: drawing using a paint brush placing the liquid into a spray bottle to spray with filling a water brush and use as a water colour mixing liquid into mediums to change their colour Ink is water soluble semi permanent when dry, therefore you can layer other wet mediums on top of the ink with minimal running of ink. It is acid free, non toxic and non flammable.