DIY/Homebrew Pyrocat-HD
Also known as: Pyrocat
Sandy King's catechol-based staining developer. Uses catechol (pyrocatechin) instead of pyrogallol for similar staining action with reportedly better keeping properties. Produces olive-brown stain that enhances printing contrast. Excellent with stand and semi-stand development. HD indicates high-definition. Popular with large format and alternative process photographers.
Temperature
20°C
18–24°C
Dilutions
2
Form
Liquid
Characteristics
Excellent highlight separation with olive-brown stain
Dilutions
Standard dilution for rotary processing.
For stand or semi-stand development.
Shelf Life
Concentrate
Part A: 1+ year. Part B: 6+ months
Working Solution
Use immediately, discard after use
One-shot only.
Often Used For
Limitations & Warnings
- Catechol is toxic - handle carefully
- Must mix from raw chemicals
- Stain affects scanning density
- Less published data than PMK
Descriptions combine manufacturer specifications with community experience. Subjective assessments reflect common sentiment among photographers and may not match your results.