Crum, Walter

Cold concontratcnitric acid acts uptm mercury to form mercunais nitrate witli tlic evolution of nitric oxide. If concent rat csulfuric acid is present, mercurous nitrate cannot form, anil tlic nitric acid is converted by tlio mercury quantitatively into nitric oxide. The method appears to have been usctl for the first time by Walter Crum who applied it at an early date to the analysis of guncotton. 

Walter Crum (Glasgow 1796-5 May 1867), a pupil of Thomas Thomson, was the owner of a calico-printing works at Thornliebank, near Glasgow. He... 

Walter Crum in a paper read to the Glasgow Philosophical Society in 1843, mentions Hellot, etc., and Le Pileur d Apligny as teachii a physical theory, whilst Bergman and Berthollet held a chemical one. Crum proposed what is really a physical theory of adsorption, comparing the adhesion of the dye to a porous fabric with the adhesion of dissolved substances to charcoal. 

Red sulfate of indigo Indigo monosulfonic acid 1823 Walter Crum (1796-1867) Used in MuUiouse and Yorkshire, has shades similar to logwood... 

In 1809, Michel Chevreul (1786-1889) described the reactions of indigo blue (Indigofera tinctoria) and Pastel Isatis tinctoria), not realizing that the blue coloring matter was the same chemical compound [2]. He carried out a reduction of the blue color to yield an indigo white, and there followed extensive studies of its chemistry by others. Walter Crum (1796-1867) purified indigo blue by sublimation and Auguste Laurent (1807-1853) laid the foundations for the... 

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