70 ml of alcohol and water-based dye invisible ink, supplied in a shockproof plastic dark bottle, optimized for CUTTER™ markers, which reacts only under UV lights until it turns into a deep dark brown satin finish. Ideal for both indoor and outdoor sessions, BLACK MAGIC INK™ is suitable for writing on all kinds of porous surfaces such as paper, cardboard, marble, concrete and painted surfaces. It's not suitable to write on glass or other non-porous surfaces.
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