Here's another rehashed tip that I tried and it works great. I got a big pot and used 4 packages of RIT black dye. The pot was big enough to hold only half the tank but then I only needed to dye the exposed part anyway. I let it simmer for 4 hours. Rinsed it off and it is black. It stays black when washed and it doesn't scratch off like paint will. Be sure to use an electric range around a gas tank, even if it is rinsed and clean, I wouldn't take a chance with a flame. If anyone wants a photo, I will e-mail. I don't know how to post one here. It looks like black plastic. I even did a UFO floresent green vented front # plate. It's black as can be as well except for a white piece in the back that would only get a very dark blue. Anyway, for less than $5, it's worth a try and I couldn't be happier.