Soak in warm water for ten minutes, then put some detergent, gently brush with a bristle brush, and repeat several times. After brushing, the paper towel is quickly wrapped and dried. Don't dry it in the air duct or in the sun, and oil it a little. If there is still a deep place, you can only pick it with a needle, gently, and don't row. I have a pair of old walnuts, really made, and the effect is ok. When I first got it, it was all black. It's much better now.

Walnut is rich in nutritional value, and has the reputation of "Long live the son", "longevity fruit" and "treasure of health preservation". 86% of the fat in walnuts is unsaturated fatty acid. Walnut is rich in copper, magnesium, potassium, vitamin B6, folic acid and vitamin B 1, and also contains fiber, phosphorus, nicotinic acid, iron, vitamin B2 and pantothenic acid. Every 50g walnut contains 3.6% water, 7.2g protein, 3 1g fat and 9.2g carbohydrate.

Walnut contains 22. 18% crude protein, of which glutamic acid is the main soluble protein, followed by arginine and walnut aspartic acid. The crude fat content is 64.23%, of which the neutral fat content is 93.05%. Among neutral lipids, triacylglycerol accounts for 82.05%, sterol lipid accounts for 3.86% and free fatty acid accounts for 4.80%. The fatty acids in total fat and neutral fat are mainly sulfinic acid 64.48%-69.95%, oleic acid 13.89%- 15.36%. The fatty acid in triacylglycerol is mainly linolenic acid 69.98; The unsaponifiable part of sterol ester is mainly β-sitosterol, and a small amount of rapeseed sterol, stigmasterol, oat sterol -5- enol and stigmasterol -7- dilute alcohol; Sugar13%; A variety of free essential amino acids; Isoleucine, leucine, tryptophan, phenylalanine, valine, threonine and lysine. Its content accounts for 47.50% of the total amino acids.