Methylene blue

History of methylene blue

The German chemist Heinrich Caro was the first to synthesise methylene blue, also known as methylthioninium chloride, in 1876. It was the first organic dye based on hydrocarbons to receive a patent. The pure dye in powder or crystal form appears dark green. In aqueous solutions, however, it turns a very strong dark blue.

Areas of application

Methylene blue is used in chemistry, biology, medicine and dyeing. According to Wikipedia, in medicine it has been used to combat malaria, among other things. It is also used as a precursor of hydroxychloroquine and chloroquine. In microscopy, it is used for the selective staining of certain types of tissue. In aquaristics, for example, it is used as a disinfectant to keep pathogenic bacteria, fungi and parasites away from expensive farmed fish. The fish appear to be much more vital and energetic and live longer. Even in the smallest quantities, it colours paper and textiles very intensely.

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