Film Lab Store

Pyrocat HD film developer

PhotochemistryFilm developerBlack and white filmHome developing

Volume

100 ml 200 ml 400 ml 1 L 2 L 6 L

€11.46

In Stock

8 rolls 35 mm or 4 rolls 120 (at 1+1+50)
Packaging:: 50 + 50 ml
SKU:: CHEM-PYROCAT-HD-PROIAVNYK-2X50ML

Description

How far it goes

100 ml: 8 rolls 35 mm or 4 rolls 120 (at 1+1+50)
200 ml: 16 rolls 35 mm or 8 rolls 120 (at 1+1+50)
400 ml: 32 rolls 35 mm or 16 rolls 120 (at 1+1+50)
1 L: 80 rolls 35 mm or 40 rolls 120 (at 1+1+50)
2 L: 160 rolls 35 mm or 80 rolls 120 (at 1+1+50)
6 L: 480 rolls 35 mm or 240 rolls 120 (at 1+1+50)

Sandy King’s pyrocatechin developer in two parts: A and B are mixed immediately before use, 1+1+50. It stains the image, gives high sharpness and yields a negative that suits both scanning and contact printing.

What the stain does

Pyrocatechin oxidises as it develops and dyes the gelatin a greenish-brown in proportion to the silver density. That dye adds density where silver already is, so highlights compress on their own and grain is partly masked. It is why pyrogallol and pyrocatechin developers are still used for large format.

Why two parts

Solutions A and B are stable apart and thoroughly unstable together. They are mixed just before the tank is filled and poured away after one development — which is why every size here is two bottles.