For fur products that have become hard after the tanning process, you can use a solution made from 2 parts of gambier, 1 part of indica rice flour, and 3 parts of cold water. Lay the fur skin on the table with the leather side up, first spray cold water to moisten the leather. Then, dip a brush into the solution and evenly brush it onto the leather side. After brushing, let it sit still for 2-3 hours, then proceed with a second coat. Repeat this process 3-5 times. After drying, rub the leather evenly, and the leather will become soft and elastic.