Why do summer clothes fade easily when stained by sweat?

What are the harms if color fastness to perspiration is unqualified?

The composition of human sweat is complicated, of which the main component is salt. Sweat is acidic or alkaline. On one hand, if color fastness to perspiration is unqualified, it will seriously influence the appearance. On the other hand, the heavy metal ions of dye molecules on clothes are easily transferred from textiles to human skin through sweat and then are absorbed by the human body, which is harmful to human health.

The Affecting Factors of Color Fastness to Perspiration

1. When there is too much surface dyeing on the surface of fabric, under the external action, such as pressure, temperature, acid and alkali, etc., the dye is easy to transfer. So that it will affect the color fastness to perspiration.
2. If the auxiliaries added in the dyeing and finishing process is not removed cleanly after dyeing, the residual auxiliaries will cause the thermal migration of polyester dyed by disperse dyes during high temperature setting. It will affect the color fastness to perspiration.
3. In the dyeing process, the added retarding agent will play the role of leveling, but it will also weaken the cohesion between the dye and the fiber.  It will have negative effect on the color fastness to perspiration.

The Correct Washing Methods to Remove Sweat Stains

1. Please do not use hot water to wash clothes. Too hot water will make the protein in the sweat stain solidify on the clothes. That will become stains that are difficult to remove.
2. The sweat on the clothes will not only become stains, but will also produce foul smell. Hence, clothes stained with sweat should be washed in time.
3. To spray white vinegar on clothes that are stained or yellowed and then wash can effectively remove the sweat stains on the clothes.
4. To soak clothes with sweat stains in 3%~5% salt water for 1-2 hours, and then wash via normal washing process can effectively remove sweat stains.

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