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These pigments normally have a pale, off-white appearance but in sunlight or UV light they instantly change to a bright, vivid colour. The pigments revert to their pale colour when away from sunlight or UV light. If the pigment is mixed with a binder such as our acrylic base, it can be permanently applied to almost any surface. The more dilute the pigment, the less dramatic the colour change; the mixing proportions are therefore a matter for trial and error but a 50:50 mix is a good starting point. Supplied in a plastic syringe containing 3g of pigment.