indigo yellow

Indigo \In"di*go\, a.
   Having the color of, pertaining to, or derived from, indigo.
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   {Indigo berry} (Bot.), the fruit of the West Indian shrub
      {Randia aculeata}, used as a blue dye.

   {Indigo bird} (Zool.), a small North American finch
      ({Cyanospiza cyanea}). The male is indigo blue in color.
      Called also {indigo bunting}.

   {Indigo blue}.
   (a) The essential coloring material of commercial indigo,
       from which it is obtained as a dark blue earthy powder,
       with a reddish luster, {C16H10N2O2}, which may be
       crystallized by sublimation. Indigo blue is also made
       from artificial amido cinnamic acid, and from artificial
       isatine; and these methods are of great commercial
       importance. Called also {indigotin}.
   (b) A dark, dull blue color like the indigo of commerce.

   {Indigo brown} (Chem.), a brown resinous substance found in
      crude indigo.

   {Indigo copper} (Min.), covellite.

   {Indigo green}, a green obtained from indigo.

   {Indigo plant} (Bot.), a leguminous plant of several species
      (genus {Indigofera}), from which indigo is prepared. The
      different varieties are natives of Asia, Africa, and
      America. Several species are cultivated, of which the most
      important are the {Indigofera tinctoria}, or {common
      indigo plant}, the {Indigofera Anil}, a larger species,
      and the {Indigofera disperma}.

   {Indigo purple}, a purple obtained from indigo.

   {Indigo red}, a dyestuff, isomeric with indigo blue, obtained
      from crude indigo as a dark brown amorphous powder.

   {Indigo snake} (Zool.), the gopher snake.

   {Indigo white}, a white crystalline powder obtained by
      reduction from indigo blue, and by oxidation easily
      changed back to it; -- called also {indigogen}.

   {Indigo yellow}, a substance obtained from indigo.
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Yellow \Yel"low\, n.
   1. A bright golden color, reflecting more light than any
      other except white; the color of that part of the spectrum
      which is between the orange and green. "A long motley coat
      guarded with yellow." --Shak.
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   2. A yellow pigment.
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   {Cadmium yellow}, {Chrome yellow}, {Indigo yellow}, {King's
   yellow}, etc. See under {Cadmium}, {Chrome}, etc.

   {Naples yellow}, a yellow amorphous pigment, used in oil,
      porcelain, and enamel painting, consisting of a basic lead
      metantimonate, obtained by fusing together tartar emetic
      lead nitrate, and common salt.

   {Patent yellow} (Old Chem.), a yellow pigment consisting
      essentially of a lead oxychloride; -- called also
      {Turner's yellow}.
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