Cumberland's Hide Tanning formula is regarded by many as the best tanning solution in the world for furs and hides. It has been used by thousands of hunters and trappers in the USA and Canada. With this formula you can tan hides at home in less than a week for a fraction of the time and cost of traditional tanning. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.