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Artificial Manganese Dioxide

Purpurin occurs with alizarin in the madder root [20], probably also as glucoside. It may be obtained artificially from alizarin by heating with manganese dioxide and sulphuric acid [21], or arsenic acid and also by melting an alizarinsulphonic acid (the so-called alizarin purpursulphonic acid) with potash... [Pg.87]


See other pages where Artificial Manganese Dioxide is mentioned: [Pg.145]    [Pg.249]    [Pg.899]    [Pg.80]    [Pg.300]    [Pg.626]    [Pg.582]    [Pg.427]    [Pg.688]    [Pg.680]    [Pg.729]    [Pg.280]    [Pg.332]    [Pg.961]    [Pg.668]    [Pg.762]    [Pg.735]    [Pg.726]    [Pg.760]    [Pg.680]    [Pg.427]   


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