So this has been killing me for the last hour or so:
I know that I have seen in a book at some point, Tina Modotti's formula for making platinum prints. My recollection is that it was in a book, or at least a section, that also mentioned Manuel Alvarez Bravo. I wrote the formula down, but have misplaced the notebook that it is in, and I cannot remember the source of the information. I believe that there was also a mention of what type of paper he was using, as he learned the formula from her.
Does this sound familiar to anyone else? Can someone please, please, please point me to the source of this information?