Different chemical compositions lead to different tempers.
Sweaty vest can't be washed with hot water. Clothes containing iodine should be soaked in hot water before washing. Textiles stained with engine oil should be wiped with an iron at the same time, and the oil will be driven away by heat.
It turns out that a small amount of protein egg white in sweat is a kind of protein. Egg whites solidify easily in hot water. Protein in sweat, like egg white, solidifies rapidly in boiling water and is entangled with fibers. You can wash the jerseys in Jiangxi province with cold water. If you wash it with hot water, the reverse side will turn yellow and dirty. Soak clothes in cold water first, which is the advantage.
Unlike protein, iodine and engine oil do not have the problem of solidification when heated, but heat can help them get rid of fibers.
If clothes are stained with pure blue ink, red ink and watercolor pigments, wash them with detergent immediately, and then rinse them with clear water several times, which can often be cleaned. This is because their teacher made it with dyes dissolved in water. If there is any trace left, it is that the dye and fiber are combined and can only be removed with bleaching powder. The main component of bleaching powder is calcium hypochlorite, which is decomposed into methionine in water and is a strong oxidant. It can oxidize dye molecules and turn dyes into colorless compounds, which is bleaching.
Blue and black ink, blood, juice and rust are different. They are gradually oxidized in the air and become darker and darker. It's not good to oxidize them with bleach. For example, blue-black ink is an aqueous solution of ferrous tannic acid and blue dye, and iron tannic acid is colorless, so the words just written with blue-black black water are blue, which gradually oxidizes on paper and becomes water-insoluble iron tannic acid. Iron tannic acid is black, so the handwriting gradually changes from blue to black, and it will never turn brown when it meets water. To remove this ink mark, you have to turn it into a colorless compound. Dissolve the colorless crystals of oxalic acid in warm water to wash away ink marks, and iron tannic acid will combine with oxalic acid to form colorless substances, which will be dissolved in water. It should be noted that oxalic acid is corrosive to clothes and should be washed as soon as possible.
Blood contains protein and hemoglobin. Like washing sweatshirts, washing blood stains should be soaked in cold water first, and then washed with enzyme washing powder. The old blood turned dark brown because the iron in hemoglobin was oxidized in the air and rust was generated. Fruit juice also contains iron, which will also produce brown iron rust spots when it comes into contact with oxygen in the air.
Stains caused by blood, fruit juice and rust can be washed off with oxalic acid, which turns rust into colorless substance and dissolves it in water.
Ink is made of very fine carbon particles dispersed in water and animal glue. The clothes were stained with ink, and carbon particles adhered to the gaps in the fibers. Insoluble in organic solvents such as water and gasoline, very stable. General oxidants and reductants are helpless to it and can't stand any chemical changes. The ink of our ancestors' paintings and calligraphy has been black and bright for thousands of years and never brown. This is a fact.
To remove ink stains, there is only a mechanical method of rubbing rice grains and sticking ink stains on fibers. If the ink is too thick and the political and legal time is too long, it will be difficult to remove carbon particles from the fiber.
If the stain is oily and does not touch water, ballpoint pen oil, paint or asphalt, we will "attack oil with oil" and wipe it with a soft cloth or cotton yarn dipped in gasoline. The main oily color substances are dissolved in gasoline and then transferred to cloth control. Sometimes gasoline can't be dissolved, so chemicals such as benzene, chloroform or carbon tetrachloride are used, which have stronger ability to dissolve oil.
Washing away stains is the same as treating diseases, so it is necessary to prescribe the right medicine.