How white is the down? Why bleach?


In the eyes of many people, down is pure and flawless, and other colors are inferior and fake. I have heard many merchants say:“After purchasing down products, the customer found gray velvet under the fabric, and immediately returned the product. The reason was that the product was inferior and dirty, and it was useless to explain it.”Today, Jun will popularize the knowledge about down with everyone.

Are the feathers all white?

Down can be divided into white down and different-color down according to the color. Different-color down is down other than white down. There is no 100% pure white down in nature. If you want to achieve 100% pure white down, you can only do it artificially. Picking, the cost is very high.

Why bleach?

Compared with white velvet, gray, black, yellowish velvet and other different-colored velvets have limited uses and low prices. In order to increase its economic value, sell them at a good price.“Bleached velvet”Came into being.

Common velvet bleaching uses oxidant treatment and reducing agent treatment. Oxidative bleaching mainly uses H2O2 as the oxidant. The bleaching process requires a higher pH value, a higher water bath temperature and a longer oxidation time.

This method is difficult to control, prone to over-oxidation or incomplete oxidation, resulting in brittle down, easy yellowing and serious color change after bleaching. The oxidized down is strongly acidic, and the use of this kind of down by consumers will cause certain harm to the body. The reducing agent mainly plays a role in chemical setting of down and down, rather than decolorization and bleaching.

It is difficult for natural things to be perfect. Different-color velvet is not an impurity or dirt, and has no effect on the quality. The national standard stipulates that the content of different-color velvet should be within 1%. Consumers love down because it is a natural protein fiber, which is light and has excellent thermal performance. However, some consumers pay more attention to the aesthetics of down and cannot bear a little bit of flaws in different-colored down, which is a bit of a waste. Blindly pursuing pure and flawless down, the final use may be“Bleached velvet”oh!

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