Response to adding sodium sulfite to developer

I have only tried this with Edwal FG7 and it yeilds higher emulsion speed and improved highlight detail. I use it exclusively with infra- red 35mm where highlight detail is so easily lost. It makes a good developer when push processing older technology 35mm films like tri-x and hp5. I never considered the ability to extend developement times an asset in and of itself, I'm always trying to figure ways to shorten developement times... t

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