French chemist (1748–1822). His contributions to chemistry include the analysis of ammonia and prussic acid and the discovery of the bleaching properties of chlorine. Untranslated ALS in French, signed twice, “Berthollet,” one page, 5.5 x 8. In very good condition, with light creasing, a uniform shade of toning, scattered foxing, a few lines of text crossed out, trimmed edges, and a horizontal mailing fold passing through both signatures. RRAuction COA.
