Quote Originally Posted by Annie
How would the testing be done to determine if in fact the silver had been replaced with platinum in toning process? If this is in fact occurring do you think would it be more perminant than something like selenium?

Annie,

There was a long thread of this topic recently on the largeformt site. Go to http://www.largeformatphotography.in...p?topic=496894 and join the thread, the title of which does not suggest any relevancy to your question, about halfway through. There was also some further discussion of this issue on the alt-photo-process list. If you have further questions after reading all that materias let me know.

Jorge may also have other comments to make at this time about the issue.