Edible compositions colored with (2-alkoxy-4-sulfonyl-5-alkyphenyl)azo-1-hydroxynaphthalene sulfonic acids
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United States of America Patent
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Nov 17, 1987
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N/A
app pub date -
Jul 18, 1986
filing date -
Jun 5, 1984
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Expired
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Abstract
Salts of phenylazonaphthyl sulfonic acids useful as blue-red colorants for textile fabrics, cellulosic fibers and edible compositions are prepared by diazotizing aniline sulfonic acid and coupling the resulting diazo compound to a 1-hydroxynaphthalene mono- or disulfonic acid.
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