I went the Bostick & Sullivan site to check out the information on rollo Pyro. Fascinating. Especially the tanning action that it has on the denser areas of the neg allowing the shadows to continue to develop proportionally. Sadly. I think that I have to wait to establish a more permanent and dedicated darkroom before exploring new [to me] processes. Thanks for pointing me to rollo anyway.
This thread has shown once again that APUG members are both knowledgable _and_ helpful. Thanks to all.