Pyrogallic Acid

_Michal_ · Post by **_Michal_** » Sat Apr 26, 2014 1:57 pm

Really nice

Olympusman · Post by **Olympusman** » Sun Apr 27, 2014 7:41 am

Thanks, Michal.
I still maintain a "wet" black and white darkroom and formulate my own film and paper developers, so I have a great many chemicals at hand. Just yesterday I made a mix of D-23 for World Wide Pinhole Photography Day entries.
For those of you who don't have scales, here is my D-23 formula:

400ml of 100 F water.
1 tsp Metol (Elon)
I TBS Sodium Sulfite
Dissolve and add water to make 500 ml.
Dev times at 68 F

ISO 100 films 5.5 mins
ISO 200 films 6.5 mins
ISO 400 films 8 mins

Pyrogallic Acid was used in PYRO developers which were very popular in the early 20th Century. Many of the formulae were "staining" developers that stained the interstices between the film grains to produce a more "velvity" texture.

carlos.uruguay · Post by **carlos.uruguay** » Sun Apr 27, 2014 7:51 am

Nice photo.
Thank you for sharing your knowledge