Snake mites start off their life being clear colored, they turn darker and eventually get black as they fill up with blood. The only way to be assured of getting rid of snake mites is to use a poison like Provent-a-mite or one of the other permetherin based poisons. You need to follow directions exactly and don't over do it as you want to kill the mites not your snake.

Some people will recommend various baths or oils or other homeopathic remedies, these remedies do kill a lot of mites but they are generally not very effective over the long term. Unless you have a very light and very recent infestation, you'll have mites over and over again as new generations hatch. Mite eggs are very resistent to poisons and one of the benefits of the permetherin bases poisons is that it stays in the environment long enough to catch and kill new mites as they hatch thus breaking the cycle.