These intense, brilliant colors are produced from dyes surrounded by a polymer coating. To increase the brightness, apply over a light colour, such as Golden White Gesso. Applying varnishes will reduce fading, but diminish the glow under ultraviolet (black) light. To modify the consistency, use acrylic mediums or water. For slower drying use acrylic glazing mediums or retarder. Clean with soap and water. Colours are not lightfast.