All four halides were identified by French scientists, (Table 1) with H.Davy from Great Britain, sharing the discovery of chloride with Gay-Lussac in 1809-1810.This series of publications is part of a book on the Iodine Project which was implemented by the author six years ago.

As a side note, “spontaneous generation” iconoclast Louis Pasteur who left his name to “pasteurization” was a student of Balard.

Some 60 years after the discovery of bromine, Moissan survived long enough to characterize the last stable halogen fluorine in 1886.

This first installment of this series deals with the history of iodine from discovery to essentiality, covering a period of 100 years.

The discovery of the stable halides — chloride, iodide, bromide, and fluoride — seems to have been a French enterprise.

This enterprise also failed, and he died in poverty.

Fifteen years after the discovery of iodine, Balard discovered bromine serendipitously while developing a method to measure iodine in seaweeds and other plants obtained from the Atlantic Ocean and Mediterranean Sea.One day toward the end of 1811, Courtois added too much acid to the suspension of seaweed ash.The iodides in seaweed were oxidized to iodine, which sublimated and formed a violet vapor above the preparation.Chlorine water was added to the test solution, to which starch and sulfuric acid had already been added.The iodine was manifested by its characteristic blue color at the interface of the test solution and the chlorine water.“Gay-Lussac and Thenard made a fundamental contribution to the realization that so-called oxymuriatic acid contained no oxygen and was an element …