I think I discovered the trick last night before going to sleep.
Coffee will be able to make an image that is developed in water, but only under one condition: that is is used with a sensitive silver solution already mixed it.
A bit like those old Ilford RC Rapid papers that had a built-in developer. When kept in the dark, nothing happens. If you expose the paper, if it is kept dry, only the silver will become sensitized. But when you soak-it in some sort of activator, the silver develops.
It will stop developing when the developer is exhausted. Soaking it in a salt brine solution then desensitizes the remaining silver to ensure better conservation.
Coffee will be able to make an image that is developed in water, but only under one condition: that is is used with a sensitive silver solution already mixed it.
A bit like those old Ilford RC Rapid papers that had a built-in developer. When kept in the dark, nothing happens. If you expose the paper, if it is kept dry, only the silver will become sensitized. But when you soak-it in some sort of activator, the silver develops.
It will stop developing when the developer is exhausted. Soaking it in a salt brine solution then desensitizes the remaining silver to ensure better conservation.
