Kind of dirt

Dirt refers to the grease-like objects adhering to the carrier and the adherends of the grease-like objects. Its composition is very complex, but according to the different forms, it can be roughly divided into solid dirt, liquid dirt and special dirt. The most common solid dirt is rust, dust, carbon black particles, etc. The surface of these objects is generally negatively charged, so it is very easy to adsorb on the substrate. The general solid particle dirt is insoluble in water, but they are easily dispersed in the aqueous solution with detergent, and the solid particles with larger particles are easier to be removed. Most common liquid dirt is oil-soluble, and most of them can be saponified with lye, which is why detergents are mostly alkaline. Special dirt is mainly blood stains, plant juices, human secretions and other substances that are difficult to remove. This type of dirt is mainly removed by bleaching agents, because the strong oxidizing properties of bleaching agents can destroy their chromophores.
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