Tri-Art's Finest Quality Ink is a professional, water-resistant ink made with 100% acrylic polymer emulsion. The Line offers a range of highly pigmented colours with either 3 or 4 star rating for lightfast permanence to ensure the colours will last longer and resist fading over time. Colours may be mixed together, diluted with water or added to mediums for desired tones and effects. Opacity and finish will vary depending on each colour's pigment; matte and opaque, glossy and transparent or semi gloss and semi opaque. ? Water-like in consistency – will not leave stroke impressions. Tri-Art's Flow Release may be required for extra fine nibs and needles. Always test your methods and materials to ensure results prior to applying to a final work.