Crossword-Solution: PYROGALLOL
Dictionary
| Word | Word Type | Definition |
|---|---|---|
| Pyrogallol | n. | 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. |
We have 4 clues for the answer “PYROGALLOL”
| Clue | Answers |
|---|---|
| pyrogallic acid | 1 answer |
| COLOURLESS crystalline substance | 3 answers |
| crystalline substance | 11 answers |
| ACID, type of | 33 answers |
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Poet’s word, with inverted comma, for the end of the day
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E
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E
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N
Hint 1 meaning
The old plural of Eye.
Hint 2 anagram
NEE
Hint 3 another clue
AND STILL ___
34 +2
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Sentences with PYROGALLOL (5)
Ann._, 1787, 3, I.] in 1787, discovered gallic acid in fermented gall extract, and in the same year Kunzemuller [Footnote:_Ibid._, 1787,3,413.] separated gallic acid (or pyrogallol) as a crystalline body from oak galls.
Meunier and Seyewetz [Footnote:_Collegium_, 1908, 315, 195.], for example, were able to show that phenol, _p_-aminophenol, chlorophenol, trinitrophenol, catechol, resorcinol, hydroquinone, monochlorohydroquinone, orcinol, pyrogallol, and gallotannic acid precipitate gelatine from its aqueous solution, that is, to a certain extent possess tanning properties.
When pyrogallol is sulphonated with concentrated sulphuric acid a violet-coloured sulphonic acid, soluble in water, is obtained, which, when treated with formaldehyde first in the cold and then when heated, yields a solid deep red-coloured mass, which precipitates gelatine but not aniline hydrochloride, and gives a blackish-brown colour with ferric chloride.
Baeyer's observation, [Footnote: _Ber_., 1872, 5, 280, 1096.] that pyrogallol on condensation with formaldehyde yields an amorphous body soluble in water, which precipitates gelatine and is very similar to tannin, was confirmed by Caro [Footnote: _Ibid_., 1892, 25, 947.] and Kahl.
Whereas the catechol tannins (_i.e._, fir, gambir, hemlock, cutch, mangrove, and quebracho) are coloured black, those of the pyrogallol class (_i.e._, algarobilla, dividivi, valonea, gallotannic acid, myrabolams, and sumac) bluish-black, and the "mixed" tannins (_i.e._, canaigre, oak, and mimosa bark) bluish-purple by iron alum, Neradol D is coloured a pure blue.