Hello Ron, The silver in photographic emulsion is not colloidal silver but photosensitive silver compounds, most notably the silver halogens.
The substance in coffee which reacts with the silver ions in the emulsion, does so only by virtue of the silver's association with the substances it is in intimate contact with. In other words, what you read in this article does not apply to colloidal silver. Regards Ivan. ----- Original Message ----- From: "Ron Hackley" <[email protected]> To: "Silver List" <[email protected]> Sent: Wednesday, 5 July 2000 07:41 Subject: CS>Coffee and CS reaction, ph of CS process > Hi List, > > I found an article about the possibility of using coffee as a > photographic (re: silver) developer at: > http://www.rit.edu/~andpph/text-coffee.htm > > ...."Without the pH maintenance, photographic development would be > difficult to control since both acid and/or base are being generated > with every silver ion to silver atom conversion within the image."... > > Which I should add was a reference given in an interesting "must read" > CS research paper by John Marshall Dudley (any relation Marshall?) at: > http://www.silver-lightning.com/research2.html > > The merits (or not) of drinking coffee aside, could components of coffee > (mixed in the stomach or bloodstream) contribute to making CS less > effective or more gray/bluing? Drinking coffee out of silver goblets > doesn't seem to be a good idea, but what about stirring with a silver > spoon; could that release photosensitive silver into the coffee? I know > I'm stretching things a little here but just trying to draw the question > out a bit. > > What do they mean that both acid and/or base are being generated with > every silver ion to silver atom conversion during development? Wouldn't > the reverse also be true, going from atom to ion? Are both base and acid > being created as we make CS, even LVDC, but then quickly neutralizing > each other? Or not so quickly? A case for stirring? > > Also, I thought I'd read here that CS in ion form isn't photoreactive, > yet this talks of the developing process being a conversion from ion to > atom. Can anyone explain what I'm missing? > > Many years of coffee (more recently "French Market" which has a lot(?) > of chicory in it) and several years of CS hasn't turned me gray/blue, > but that might because the Oregon rain hasn't let me get exposed enough > prior to development (sorry but couldn't resist:~D) > > Thanks :-) > Ron KC7ZWA > in Oregon > > > -- > The silver-list is a moderated forum for discussion of colloidal silver. > > To join or quit silver-list or silver-digest send an e-mail message to: > [email protected] -or- [email protected] > with the word subscribe or unsubscribe in the SUBJECT line. > > To post, address your message to: [email protected] > Silver-list archive: http://escribe.com/health/thesilverlist/index.html > List maintainer: Mike Devour <[email protected]> >
