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    The color lakes of congo red

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    Author
    Radcliffe, Robert Stanley
    Date
    1927
    Degree
    Master of Arts
    Abstract
    Congo Red, the di-sodium salt of diphenyl-disazo-bis-mapthylamine-4-sulfonio acid, forms a free, blue acid when treated with acids and the sodium replaced by hydrogen. This is insoluble but forms a colloidal suspension of negatively charged particles* The sodium salt is a dye substantive to cotton, and likewise, the free acid will dye cotton red from its blue sol. If a positively charged hydrous oxide sol is mixed with the blue acid sol, a color lake is formed by mutual precipitation. This lake will vary in color from red thru purple to blue depending upon the hydrogen ion concentration, the temperature, and the concentrations of the sols in the mixture. Much experimentation has been done to determine whether dyeing and the formation of color lakes are adsorption phenomena rather than stoichiometrio chemical processes. It is the purpose of this paper to investigate the formation of color lakes and the action attending dyeing by Congo Red.
    Citation
    Radcliffe, Robert Stanley. "The color lakes of congo red." (1927) Master’s Thesis, Rice University. http://hdl.handle.net/1911/90237.
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    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892