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2ml Concentrated Ultraviolet Dye - enough to make over 1 litre UV reactive liquid. Add to water to make coloured water that glows under UV black lighting. NOT GLOW IN THE DARK. It glows a bright neon colour in the dark when a ultraviolet blacklight is on it. Shipped in 2ml syringe for ease of use - add drops to water to make your own large amounts of fluorescent liquid. Non-toxic