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Photo Forum / Film Photography / Darkroom / January 2005Distilled vs Deionised for mixing chemicals
Hi anyone have any idea whether there is any appreciable difference between distilled and 'deionised' water for the purpose of mixing chemicals from powder (like D-76)? Is the use of special water important at all? Thanks Paul >Subject: Distilled vs Deionised for mixing chemicals >From: pdm notpaulmead@netvigator.co.uk [quoted text clipped - 11 lines] > >Paul Kodak reccomends tap water. Arthur Kramer 344th BG 494th BS England, France, Belgium, Holland, Germany Visit my WW II B-26 website at: http://www.coastcomp.com/artkramer Depends on where you live and the source of your tap water. BTW my wife works in a QC lab and the quality of even de-ionized water can vary from brand to brand, they buy distilled water for mixing certain reagents since their DI system is erratic (plenty good for other things just not some titration reagents). So I'd suggest sticking with one brand of distilled, too. Mike  Signaturedarkroommike ---------- > Hi > [quoted text clipped - 6 lines] > > Paul > Hi > [quoted text clipped - 6 lines] > > Paul Paul, It's really dependent on your local water supply if you use distilled or deionized (demineralized) water. If your local supply is consistent, untreated and not too hard, shouldn't be a problem. However, I have an argument forcing me to use demineralized water. That being, I've spent a LOT of hours calibrating my processes to assure consistent and repeatable results. I won't/don't jeopardize those calibrations to seasonal or climatic changes affecting the water used to create my chemistry. Between [steam] distilled or deionized/demineralized water, you likely won't detect any differences. Jim > > "pdm" <notpaulmead@netvigator.co.uk> wrote > > [quoted text clipped - 5 lines] > > Jim I know what distilled water is; condensate. What though is deionized? Without ions how can it differ from distilled? Dan >> > "pdm" <notpaulmead@netvigator.co.uk> wrote >> > [quoted text clipped - 8 lines] > I know what distilled water is; condensate. What though is > deionized? Without ions how can it differ from distilled? Dan Someone else can give a more technical explanation, however the short story is deionized and demineralized (as I understand it - the same stuff) has the minerals and other impurities removed by filtering through resins. Those resins remove the mineral ions (hence - deionized or demineralized) and other unwanted ions (like chlorine and fluorine). demineralised - two valent ions (calcium, magnesium) replaced with sodium -> hardness gone. but salt content stays, deionsed - all cations (metals) replaced with H+, and anions with OH-, equals to distilled water. For photo applications tap is mostly OK, demineralised - GE, deionised, distilled well above requirements. *RE: Jim Phelps wrote: *> *> > "pdm" <notpaulmead@netvigator.co.uk> wrote *> > *> > ... is any appreciable difference *> > between distilled and 'deionised' water... *> > *> *> ... distilled or deionized (demineralized) water. *> Between [steam] distilled or deionized/demineralized water, *> *> Jim * *I know what distilled water is; condensate. What though is *deionized? Without ions how can it differ from distilled? Dan About 50 years ago there was a problem NOT using tap water because the gelatin needed the ions to swell properly ! This was before I even started working in the darkroom which must have been 1965 or 1966. > Hi > [quoted text clipped - 6 lines] > > Paul Thanks for all your responses. I've used the deionised since it's cheap and hopefully quite consistent. Couldn't believe the price of distilled! Paul >About 50 years ago there was a problem NOT using tap water because the >gelatin needed the ions to swell properly ! This was before I even started [quoted text clipped - 10 lines] >> >> Paul |
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