HC110 shelf life

I had a partly used bottle of HC-110 that was still good after 4 years. The only real answer is to try it on something that doesn't count. I keep a few roughly 10 exposure rolls of 35mm film around just for experiments. Here is where I would use one.

I had an open bottle of HC-110 that was still good after 4 years. The only real answer is to try it on something unimportant. I keep a few roughly 10 exposure rolls of 35mm film around for experiments. This is a situation where I would use one.