Disposing of used chemistry - Darkroom Techniques Forum

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Q. Disposing of used chemistry

Asked by Patrick Ziegler (K=21797) on 12/16/2004

How is everybody getting rid of your used chimicals. I feel a bit leary about just tossing the bottles in the dumpster, I have in the past filled the sink with water added the chemicals and let it go down the drain. Not sure if that is a good thing to do either.

(Color print and slide chemistry)

Phillip Cohen

(K=10561) - Comment Date 12/17/2004

Pat unless you are using large amounts, just mix it all together or spill it out together in the sink. It should mix and make a neutral ph that won't hurt the pipes etc... Not sure if you should do that if you are on a septic system as it may kill off the bacteria. If you are using large amounts then you will need to suck the silver out, and all that kind of stuff. Most schools I have seen just flush it down the drain and they use 10 times the amount I use. But then again the govt. can get away with things us peons cannot.

Phil

ann clancy (K=2014) - Comment Date 12/17/2004

put the developer into the stop bath and wash with lots of water. fixer can be saved and the silver removed, which is what we do,even if we are not a big government agency.
Perhaps you could take the fixer to your local dealer and see if they have a recovery unit. (most do) and they can take it off your hands.

one chemcial that needs special attention will be KRST. Don't dump that. it can be reused over and over and when it does seem to be beyond use. place a few old, blah, prints in it and let them sit for a few days to exhaust the selenium.

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