Reynolds Advanced Materials
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UV Glow Additive for Urethanes and Silicones

Cryptolyte® is a translucent liquid additive that causes cured Smooth-On silicone rubbers, urethane rubbers, plastics or foams to glow a bright blue under a focused ultra violet light source (blacklight). You will not see the glow effect without an UV light source. When mixed at low percentages it will not affect clarity or color of material. For example, Cryptolyte® can be added to Crystal Clear® water clear resins and the glow effect will not be evident until the casting is illuminated by a UV light source. Applications include special effects, Halloween mask and prop making, theme displays and security – you can make parts that are virtually undetectable in normal light but glow under UV black lighting.


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ProductSizeNet WeightPriceQuantity
Cryptolyte UV Glow Additive for Urethanes and SiliconesWARNING: Prop 65 NoticeWARNING: This product can expose you to chemicals including Toluene, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to
Look Closer 1 ounce 0.06 lbs. $7.25

Technical & Safety

Technical Bulletin


Additional Documents

alertWARNING: THIS PRODUCT IS FLAMMABLE. Exercise extreme caution and follow safety protocol for handling flammable liquids. Refer to SDS for further safety information.