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Formaldehyde was not invented...it was discovered.
Formaldehyde is a natural occuring substance in the environment and has a chemical formula CH2O, it is the most simple of all aldehydes.
It is a colorless gas with strong odor and is instrumental in developing other modern materials, especially polymers.
In 1867, a German chemist August Willhelm von Hofmann discovered formaldehyde's ability to preserve things and it quickly replaced previously used substances such as alcohol and arsenic.
In Histology, the substance "Formalin" is used as a standard fixative to preserve tissue for pathological studies.
It is actually 10% Neutral Buffered Formalin (NBF) that is made from a 100% stock solution.
The 100% stock solution is water saturated with 40% formaldehyde (volume) or 37% (mass). A buffer is added to the solution to keep it stable.
Other similar substances such as gluteraldehyde can be used as fixatives also, but formaldehyde (formalin) is most common.
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