SO-Strong Colorants can be added to any Smooth-On liquid urethane rubber, urethane plastic or urethane foam (do not use with Smooth-On silicones). They are highly concentrated, offer excellent dispersion and consistent color. A very small amount will color a proportionally large amount of liquid urethane material.The more you add in proportion to the volume of liquid urethane, the more dramatic the color effect. Recommended loading range is .01% to 3% of total system weight. Do not overload the iiquid urethane system or cure inhibition/oozing may occur. Colorants have a limited shelf life and should be used as soon as possible. Close lid tighly after each use.Color Pigments (Opaque): White & FleshtoneColor Tints (Translucent): Black, Yellow, Brown, Purple, Green, Orange, Red & Blue.Properties Sampler Pack of 9 Colors contains the following : Green Blue Yellow Red Black White Purple Flesh Brown DIRECTIONS: After dispensing the required amount of urethane material Parts A and B into measuring containers, add colorant to Part B and mix thoroughly. Combine Parts A and B into a mixing container and mix as directed by the urethane product technical bulletin. BLENDING:Combine different colors on a palette to create a custom color before adding to material as directed above.Media UVO vs. SO-STRONG Color Tints Documentation Technical Bulletin