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alizarine Alkali blue anthracene anthraquinone atom has replaced atomic weights atoms of carbon atoms of hydrogen atoms stretch azo chromophore barium atom carbon atoms chain formation chem chemical compounds chemical element chemical structural Chemists discovered chlorine atom chrome yellow chromium COLOR AS LIGHT COLOR CHEMISTRY color materials color-producing colors grew components double grip dyes extensive research four hands fundamentals of chemistry groups have replaced Gum solutions gum varnishes hydrazo chromophore hydrogen atoms ical INTERNATIONAL PRINTING INK Knowledge of colors laboratory lacquers large scale lead chromate lead nitrate lithol red methyl groups Methyl violet modern colors molecules of water N—CI I CH3 naphthalene molecules nitrogen OH auxochromes organic colors pigment plant pounds printer PRINTING INK CORPORATION produced quinizarine replaced 3 hydrogen replaced a chlorine replaced the sodium ring formation salt sodium atom Sodium chromate structural diagrams structural formula substance sulfonated phenyl group synthetically tumblerful vehicle