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Photographer's Formulary PyroCat HD is a high acutance developer, formulated by Sandy King as an alternative to other pyrogallol-based staining developers.
The advantages over PMK that Mr. King cites for his formula include an approximately 1/3 stop greater effective film speed, 10-15% shorter development times, more consistent staining action, lower toxicity, and no streaking or mottling with reduced agitation.
Catechol (pyrocatechin) has a high vapor pressure and it is a phenol. The high vapor pressure means that solid catechol evaporates readily. When you open a bottle containing solid catechol, you can smell it. Always store solid catechol in a tightly capped glass container. When mixing a solution containing catechol, work in a ventilated area. When catechol is in solution, its high vapor pressure is not a problem.
In the Box
Photographers' Formulary PyroCat-HD Film Developer (Dry) - Makes 50 Liter (13.2 gal)
Table of Contents
Black and white film development
The fact that catechol is a phenol means that it is corrosive and can cause skin burns. If you should spill a solution of catechol, wash the area (or skin) with soap and water. Use tongs or rubber gloves whenever possible when working with this compound or its solutions.