pyrogallol

The developing chemistry is similar to that of catechol or pyrogallol.

In 1969, he began experimenting with the forgotten photographic developing agent Pyrogallol.

This enzyme is also called pyrogallol 1,2-dioxygenase.

Pyrogallol was also used as a developing agent in black-and-white developers, but its use is largely historical except for special purpose applications.

It consists essentially of certain derivatives of pyrogallol.

It is synthesized from pyrogallol using zinc chloride and acetic anhydride.

Syringol is a dimethyl ether of pyrogallol.

Pyrogallolarenes are related macrocycles derived from the condensation of pyrogallol (1,2,3-trihydroxybenzene) with an aldehyde.

Gallacetophenone is the acetyl derivative of pyrogallol.

Hence, this enzyme has one substrate, 3,4,5-trihydroxybenzoate, and two products, pyrogallol and CO.

Berkeley's formula contained pyrogallol, sulfite and citric acid.

The bark and especially the fruit yield pyrogallol and catechol to dye and tan leather.

Through testing at isobestic points, it has been determined that bromopyrogallol red is a stronger acid than Pyrogallol Red.

Other developing agents in use are p-aminophenol, glycin (N-(4-hydroxyphenyl)glycine), pyrogallol and catechol.

The same technique is repeated for oxygen, using the pyrogallol, and carbon monoxide using the ammoniacal cuprous chloride.

Chestnut tannin is one of the pyrogallol class of tannins (also known as hydrolysable tannin).

Among others, Braconnot discovered gallic and ellagic acids (1818) and pyrogallic acid (pyrogallol) which later enabled the development of photography.

Alkaline solutions of pyrogallol, benzene-1,2,3-triol absorb oxygen from the air, and are used in the determination of the atmospheric concentration of oxygen.

Antiseptic; skin affections (psoriasis, etc.), in 10 p. c. solutions or ointments, being a good substitute for pyrogallol, as it does not stain nor poison so easily.

The enzyme pyrogallol hydroxytransferase uses 1,2,3,5-tetrahydroxybenzene and 1,2,3-trihydroxybenzene (pyrogallol) to produce 1,3,5-trihydroxybenzene (phloroglucinol) and 1,2,3,5-tetrahydroxybenzene.

In 1882 the British Journal of Photography Almanac included his new formula of pyrogallol, sulfite and citric acid in their publication.

Epigallocatechin and gallocatechin contain an additional phenolic hydroxyl group when compared to epicatechin and catechin, respectively, similar to the difference in pyrogallol compared to pyrocatechol.

Herbert Bowyer Berkeley experimented with his own version of collodian emulsions after Samman introduced the idea of adding dithionite to the pyrogallol developer.

The ferric ions react with the tannic acid or some derived compound (possibly gallic acid or pyrogallol) to form a polymeric organometallic compound.

In 2005, research produced a pyrogallol[4]arene by simply mixing a solvent-free dispersion of isovaleraldehyde with pyrogallol and a catalytic amount of p-toluenesulfonic acid in a mortar and pestle.