Has anyone here done any printing with coffee as a developing agent on FB paper? My experience is strictly with RC papers... Toning or staining... the effect is pleasing, though I have no idea of the archival qualities of this method. I have coffee prints that are a year old that look the same as the day I printed them.
Tea and coffee don't actually "tone" a print - they stain the paper. The result is a image formed in silver, with the tonality associated with the fundamental design of the paper and chemistry, and with the paper stained to a color governed by by the tea or coffee.
Tom Barill did a series of large format images of plants that he stained with tea. He said that the cheap supermarket brand worked better than "good" tea.
Shiny has a couple of prints stained with tea in the gallery now. Look good and process seems simple and cheap. He has kindly given some facts about his process. I think they are RC prints. My assumption is that the effect for FB would be similar but this is an assumption on my part. Have a look.