In fact, when Photographer's Formulary began selling gum kits (and/or
materials, I forget which) they used that very line..."gum can't do fine
detail." I quoted it-- not in P-F, that is, Post-Factory, but on the list,
referring to them as PF (Photographer's Formulary) but Peter Fredrick thought
"PF" meant him -- as he also had a book about alt-processes. A tsimmis did
thereby ensue, which was eventually resolved, tho not before PF resigned from
the list and then (if memory serves) was persuaded to return.
Sudden Recall:
In the jesting that followed the conflation of PFs, one fellow assured us
it stood for Pink Floyd.