GULFF UV Color resins are made for attraction. Fish can see colors then use colors. You are the artist. Think pink create candies for graylings or make glowing green streamer heads and bodies. This hot resin series is one of the coolest uv resin series ever made for fly tying. These products have high fluorescence and in the dark glowing effect. Use UV light for making the effect. Use UV light or normal flashlight to activate phosphorus.