I’ve used some of them as there are several.
“In 1969, while photographing in Canyon Del Puerto, California, Wimberley "saw that physical objects, such as trees, also have a tangible and real spiritual dimension that can be perceived." After this experience, he began working exclusively with black-and-white film because he felt that, "black and white photography had the potential to embody and communicate the spiritual aspect of things."
A significant part of Wimberley's experimentation was in the area of film developers. In 1969, he began experimenting with the forgotten photographic developing agent Pyrogallol. In 1977, Petersen Photographic published Wimberley's formula for WD2D, a pyrogallol-based film developer. He says, "When I first made black and white prints I could not attain the tonal characteristics I could see in my mind. WD2D gave me the tonal characteristics I needed to best communicate what I needed to communicate." WD2D is similar to other pyrogallol-based film developers because it promotes high sharpness and granularity while smoothing grain using a dye mask. However, WD2D differs from older pyrogallol-based film developers like the ABC Pyro formula used by Edward Weston because WD2D is designed to work well with modern, single-emulsion black-and-white films.”
Article:
https://en.m.wikipedia.org/wiki/John_Wimberley