Hi Scott, sorry coming to bug you more about D-19 My processing schedule to process super 8 films is:
Pre-wash = 2minutes First Developer = 7minutes Wash water = 2minutes Bleach bath = 3minutes Water wash = 2minutes Clearing bath = 2minutes Water wash = 2minutes Re-exposure = 500watts at 1 meter for one minute Second developer = 4minutes Wash water = 2minutes Fix = 4minutes Running water wash = 10minutes 1. I don't have a stop bath so I cannot mix it with the developer to make it PH neutral. Can it still be dumped or will I need to make it PH neutral first? If so could you suggest something? 2. The bleach bath is made from Potassium Dichromate and Sulphuric Acid so I'm guessing that will need to be stored, right? There is 12ml of acid in a 1 liter mix. 3. Clearing bath can go down the sink, as you said. 4. Fixer is toxic because of the silver. Any idea how I can reclaim the silver out of the bleach bath and fixer bath? Is there a processes? Sorry for all the questions Scott, I just want to be fully informed before I throw anything down the drain. If I can reclaim the silver once a year from the stored chemicals that might also be looking into. Thanks again, really appreciate the help! Kevin > Date: Fri, 13 Apr 2012 15:15:12 -0400 > From: klu...@panix.com > To: frameworks@jonasmekasfilms.com > Subject: Re: [Frameworks] Storing E-6 and D-19 > > The B&W is not too bad. > > The stop bath can be mixed with the developer and you can verify that it's > fairly pH neutral. This can be dumped down most drains safely. You can drink > it if you want, but the sulfite makes it taste like rotten eggs. > > The fixer is worth money. It's toxic because it's full of silver, and silver > is worth more than $30/oz. right now. Don't discard it, sell it. > > Clearing bath is just sulfite, it can be dumped down the drain. > > The bleach is a real problem, and how much of a problem it is depends on > what kind of bleach it is. There are at least three bleach chemistries > historically and the nastiest of the three (ferricyanide, which really isn't > as nasty as it sounds) is mostly gone now. Again, though, as it becomes > exhausted, it becomes full of valuable silver. > > I live in Virginia on the edge of the Chesapeake watershed and so we have a > whole lot of additional regulations about chemical disposal, but talking to > the city waste water guys, they don't mind anything but the fixer and bleach, > and they are okay even with those if they are diluted sufficiently. > > Color processes vary a lot on what is in them, but again Kodak will send you > a nifty little brochure on chemical disposal courtesy of the nice people in > department 412-L. > --scott > _______________________________________________ > FrameWorks mailing list > FrameWorks@jonasmekasfilms.com > https://mailman-mail5.webfaction.com/listinfo/frameworks
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