Photographers' Formulary Pyrogallol (30g)

Photographers' Formulary Pyrogallol (30g)

Photographers' Formulary Pyrogallol (30g)

B&H # PHP30GZ MFR # 10-1110 30G
Photographers' Formulary Pyrogallol (30g)

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  • Pyrogallic Acid
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  • 1Description

The chemical Pyrogallol is an active agent in Pyro film developers.

At one time, Pyro was a universally used developer. It was even available in prepackaged formulas from companies such as Eastman Kodak. Unfortunately, it has been almost entirely replaced by metol-hydroquinone and Phenidone-hydroquinone type developers.

The main reasons for that are the fact that Pyro stains, it must be handled carefully, and it does not keep well in solution.

When used correctly, Pyro creates a stained image of unprecedented tonal scale, especially in high values.
In combination with either metol or Phenidone, it exhibits super-additive characteristics. It produces an overall stain on the negative, which adds to the contrast of the silver image. The stain is a desirable part of a properly developed Pyro image.
Pyro tends to oxidize very rapidly in solution and cannot be kept without the aid of preservatives such as sulfuric or other acids, sulfites. Etc. Pyro should be added after these preservatives have been mixed with water.
Pyro oxidation products act as strong anti-fogging agents.
Table of Contents
  • 1Description
Synonyms 1,2,3-Trihydroxybenzene
Pyrogallic acid
Appearance A toxic white lustrous crystalline phenol
Fine white powdery crystals
Heavy, prismatic crystals
Uses Active agent in Pyro black & white film developers
Chemical Formula C6H6O3
Notes Caution: Poisonous; wear a dust mask and gloves when working with the powder, use adequate ventilation, when working with the solutions. Clean up any powder or spilled solutions, and dispose of the residue safely.

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