| slovo | definícia |
gallic acid
(encz) | gallic acid, n: |
Gallic acid
(gcide) | Gallic \Gal"lic\ (277), a. [From Gall the excrescence.]
Pertaining to, or derived from, galls, nutgalls, and the
like.
[1913 Webster]
Gallic acid (Chem.), an organic acid, very widely
distributed in the vegetable kingdom, being found in the
free state in galls, tea, etc., and produced artificially.
It is a white, crystalline substance, C6H2(HO)3.CO2H,
with an astringent taste, and is a strong reducing agent,
as employed in photography. It is usually prepared from
tannin, and both give a dark color with iron salts,
forming tannate and gallate of iron, which are the
essential ingredients of common black ink.
[1913 Webster] |
gallic acid
(wn) | gallic acid
n 1: a colorless crystalline acid obtained from tannin |
| | podobné slovo | definícia |
pyrogallic acid
(encz) | pyrogallic acid, n: |
Gallic acid
(gcide) | Gallic \Gal"lic\ (277), a. [From Gall the excrescence.]
Pertaining to, or derived from, galls, nutgalls, and the
like.
[1913 Webster]
Gallic acid (Chem.), an organic acid, very widely
distributed in the vegetable kingdom, being found in the
free state in galls, tea, etc., and produced artificially.
It is a white, crystalline substance, C6H2(HO)3.CO2H,
with an astringent taste, and is a strong reducing agent,
as employed in photography. It is usually prepared from
tannin, and both give a dark color with iron salts,
forming tannate and gallate of iron, which are the
essential ingredients of common black ink.
[1913 Webster] |
pyrogallic acid
(gcide) | Pyrogallol \Pyr`o*gal"lol\, n. [Pyrogallic + -ol.] (Chem.)
A phenol metameric with phloroglucin, obtained by the
distillation of gallic acid as a poisonous white crystalline
substance having acid properties, and hence called also
pyrogallic acid. It is a strong reducer, and is used as a
developer in photography and in the production of certain
dyes.
[1913 Webster] |
pyrogallic acid
(wn) | pyrogallic acid
n 1: a toxic white lustrous crystalline phenol used to treat
certain skin diseases and as a photographic developer [syn:
pyrogallol, pyrogallic acid] |
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