When students are writing and drawing, it is inevitable that they will accidentally leave ink on their clothes with the ballpoint pen in their hands. Even if you wash it immediately with various tools such as brushes, it will not have any effect. But medical alcohol solves this problem. Why?
This is because the chemical composition of ballpoint pen oil is mainly some oily substances and alcohol-soluble dyes, which are all organic substances. And medical alcohol contains ethanol, ethanol is also organic matter, due to the similar principle of phase solubility, ethanol can dissolve the ink in the ballpoint refill. In addition, the solubility and volatility of ethanol are very strong, which accelerates the dissolution of ink.
In real life, the use of flower lotion water also has such an effect, because the main ingredient in flower lotion water is alcohol, so it is easy to dissolve the oily handwriting left on clothes.
In the industry, there are many types of ink cleaners, common white electric oil, tianna water, etc., they are organic solvents, with high fat solubility and high volatility, strong decontamination ability, often used as cleaning agents in industry. However, such cleaners are also particularly flammable, and when the volatilization reaches a certain concentration, combustion and explosion may occur in the presence of electric sparks or high-heat objects.
Finally, we remind everyone that some of the oils in our commonly used ballpoint pens may be mixed with some flavors and other pigments, and some "three noes", "inferior" and "fragrant" ballpoint pens contain toluene.
Benzene is a harmful substance and cannot be used in stationery. Therefore, we must not blindly pursue the fragrance of ballpoint pens, we must buy ballpoint pens produced by regular manufacturers.
This article is scientifically checked by Mou Dan, a first-level teacher at the middle school of the Experimental School Affiliated to the Haidian District Teachers' Training School in Beijing.
Xinhua Network Science Popularization Division
Popular Science China - Scientific principles are one-point
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