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Yellowing and blackening of linen is a common problem. In fact, there are some differences in the causes of the two. The quality of washing powder, water quality, bleach, washing process, etc. will all have an impact on linen.

fabric yellowing

(1) The water is not softened, the iron content in the water is high, and rust stains appear, making the fabric yellow;

(2) The temperature is too high during drying, making the fabric yellow and brittle;

(3) Chlorine bleaching itself makes the fabric yellow, without whitening;

(4) The water is not clear, often in the past, the residual chlorine water makes the fabric yellow;

(5) Excessive softener or neutralizer can easily make the fabric yellow;

(6) The quality of the fabric itself;

(7) Alkali residue;

fabric graying

(1) The washing water is not neutralized, and calcium soap remains in it.

(2) Detergent quality problems (deposition of detergent impurities).

(3) The water hardness is high (the water has not been softened), and calcium soap is produced to cover the surface and interior of the fabric.

(4) The performance of the fabric itself.

So, now that we know the causes of these problems, let's find out how to solve them.

Solve yellowing phenomenon. When washing at high temperature (60-70C), only put a small amount of washing powder (100 kg installed capacity, put 300 g of washing powder), and then put a small amount (150 g) of bleach in the state of washing, so that the silver on the towel can be removed. The optical brightener can be removed, and towels and bathrobes can be whitened without yellowing, except for yellowing of oil stains.