The negative for the picture you mention was developed in Windisch Catechol, a pyro based developer. The reducing agent in this formula is pyrocatechin, which is different from the reducer in PMK, pyrogallol. Pyrocatechin is also the reducer in Pyrocat HD
This is a minor point but it's rather confusing when someone uses the term pyro for pyrocatechin when must people will think of pyrogallol when they see pyro. Older literature is particularly bad in this respect. The accepted chemical names are catechol and pyrogallol. Pyrocatechin is a very old name and best left in the past.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.