Check the listing for details. Invisible Blue UV Reactive Water Dye Intense Glow with Blacklight!!. Condition: New. Listed at 12.99 USD. GLO Effex UV Reactive Water Dye is a concentrated UV reactive water dye used to create dramatic water lighting effects for all occasions or projects. Can also be used in any water based medium also to make glow in the dark products such as school glues, water based epoxies, etc. Highly concentrated with a mix ratio of over 50 to 1 so a little can go a long way. Just add to water and illuminate with a UV blacklight and watch the glow.Available in 6 colors:Clear/Blue (invisible in water without UV light) Alien Green Fire RedGolden Yellow Purple These are professional grade dyes used in illumination of water for commercial uses and are very bright with even a small amount.Listing includes 1 x 1oz bottle of the chosen color.Can be used for:Leak detectionWater decorationsParty decorationsArts/CraftsHalloweenComputer water cooling systemsProduct MarkingProduct TrackingRoom DecorationTracer dyeAnything you can think of glowing Can be supplied in pints and gallons just contact us for details. Please email with any questions before ordering. Check out my other items! Be sure to add me to your favorites list!