So you are saying the bare bulb in a room effect , one flared out* D76* , one crystal clear*Pyro* is a placebo effect and not real.

I think I need an asprin, I have sold all this development based on this percieved effect.

Quote Originally Posted by Michael R 1974 View Post
Pyro/Cat development tans (hardens) the emulsion. There is less silver developed and this is "made up for" by the stain which increases density proportionately with the amount of silver developed (ie the amount of exposure). This does not necessarily result in highlight compression in the negative, although there can be a compensation effect when printing on VC papers.

One thing tanning does not do, is prevent silver migration, because silver does not migrate to begin with. That is a non issue with modern hardened films.