I ended up ordering from Antec. With shipping, it was $70 for 2.5L. It worked perfectly. For now, I am processing in my bathroom, so I chose not to deal with mixing chemicals. Perhaps in the future, I will mix it myself, but only when I have a proper place to do it.
Thank you so much for all of your helpful responses. --Jay Antec link: https://kyantec.com/tips-tricks/photographic-chemicals/ On Fri, May 22, 2026 at 2:35 PM Seth Mitter <[email protected]> wrote: > Photographer's Formulary still sells Potassium Dichromate: > > https://stores.photoformulary.com/potassium-dichromate-class-6-1-bichromate-ground-ups-only-dea-form-required-choose-ups-ground-shipping-at-checkout/ > > For sulfuric acid I've successfully used battery acid from an auto parts > store, for example the SDS sheet for this stuff says it contains 30-43% > sulfuric acid (diluted in water): > > https://www.oreillyauto.com/detail/c/super-start/battery---accessories/battery-accessories--universal-/battery-chemicals/8d0625b693a9/super-start-1-quart-battery-acid/sbe3/cycleacid?pos=0 > <https://www.oreillyauto.com/detail/c/super-start/battery---accessories/battery-accessories--universal-/battery-chemicals/8d0625b693a9/super-start-1-quart-battery-acid/sbe3/cycleacid?pos=0> > > This Dichromate (not Permanganate) R-9 recipe is adapted from Tish > Stringer's excellent B&W Reversal Processing Guide <http:///>, and is > identical to the one in Kathryn Ramey's *Break The Machine* > > To Make: > > 1 L > > 2 L > > 4 L > > Water, 20°C (68°F) > > 975 mL > > 1950 mL > > 3900 mL > > Potassium Dichromate > > 9.5 g > > 19 g > > 38 g > > Sulfuric Acid 48% solution > > 25 mL > > 50 mL > > 100 mL > > (Always make the recipe in the sequence written, adding the smaller volume > of concentrated sulfuric acid to larger volume of water) > When handling/measuring Potassium Dichromate use protective equipment to > prevent skin contact or inhalation and take care to prevent powder from > becoming airborn/use a respirator > > > On Thu, May 21, 2026 at 1:05 AM Ed Inman <[email protected]> wrote: > >> Battery acid from an auto parts store is roughly 1/3 sulfuric. Dichromate >> or Permanganate can be found on ebay. >> >> If you have any training as a chemist you can pretty easily look up the >> formulas and do the math. >> >> Just be aware you are dealing with potentially very hazardous materials. >> >> >> >> >> -- >> Frameworks mailing list >> [email protected] >> https://mail.film-gallery.org/mailman/listinfo/frameworks_film-gallery.org >> > -- > Frameworks mailing list > [email protected] > https://mail.film-gallery.org/mailman/listinfo/frameworks_film-gallery.org >
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