Hi,

I was wondering if anyone knows how long a 10% silver solution (in this case for kallitypes) keeps. It was mixed with distilled water, and has been stored in a 200 ml dark amber bottle in a dark corner of my basement. I would say that it is 2 or three years old. It is perfectly clear and seems to work well. Is there a point at which it should be discarded or will it keep indefinitely?

Thanks,
Paul