Pyrogallic Acid

Images made through a microscope. All subject types.

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Olympusman
Posts: 4890
Joined: Sun Jan 15, 2012 12:31 pm

Pyrogallic Acid

Post by Olympusman »

Image
Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA

_Michal_
Posts: 486
Joined: Sun Apr 06, 2014 2:58 am
Location: Poland

Post by _Michal_ »

Really nice :D

Olympusman
Posts: 4890
Joined: Sun Jan 15, 2012 12:31 pm

Pyrogallic Acid

Post by Olympusman »

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.
Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA

carlos.uruguay
Posts: 5356
Joined: Thu Feb 23, 2012 8:05 pm
Location: Uruguay - Montevideo - America del Sur
Contact:

Post by carlos.uruguay »

Nice photo.
Thank you for sharing your knowledge

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