One of the most interesting colors to work with is motor oil. I did up some worms for a friend's request using motor oil over a light amber and again over fluorescent orange. They turned out really nice so I took time to use the left overs from his order on baits for myself. In one light the motor oil is greener than duck weed but in the shade its a nice subtle brown. Crazy how it transitions from color to color by itself but then toss these other colors under it and a whole new color world opens up. Motor oil is no doubt a fun color to play with. This motor oil is Do-It's X2 color and is color fast....no bleed.