Storage options as I see them, in order of lower oxygen permeability (good for photochemical storage) to higher oxygen permeability (not as good for photochemical storage):Ī benefit of the "wine bag" and PET bottle options, is the ability to squeeze out residual air before closing. Please, if using food containers to store chem please label it very well (and permanent) with skull and bones, and keep out of the reach for other people, later wash and destroy the container, for disposal. Xtol preserves very well inside soda bottles. Carbonic acid has a pka of only 6.36 and therefore is by far not acidic enough to give coca cola its acidity, nor is it likely to interfere very badly with the pH of a developer. ![]() HDPE will work fine though.Īs to the Coca cola: as far as I know the acid is added in the firm of phosphoric acid. I can tell from first-hand experience that ldpe bottles (eg used for soft drinks) will be dissolved by Fuji RA4 developer. So a RA-4 developer may disolve PET (Koraks), while high content of Sodium hydroxide in the formula may not determine that. This theory is not directly applicable to BW darkroom regular chem, because the caustic agent is not alone, forming a tampon.Īn easy example: a PET bottle with Sodium hydroxide can also contain a certain acid to form a salt, say sea water. Everybody knows what carbonized drinks do to teeth !īe careful.if the solution contains Sodium or Potassium hydroxide (1 to 10%) you can get problems, if the bottle is made of PET see "Polyethylene Terephthalate (PET)-Chemical Compatibility" She responded that she never drank the stuff because every ingredient is shipped in Hazmat tank cars, esp the concentrated carbonic acid. My wife asked her if she got her Coke for free. Back when my wife and I were taking our honeymoon, we traveled to Kauai in a airline 3-seater next to a lady who was a Coca Cola executive. It's gotten so bad that many of our West Coast oyster farms have had to import the early stage of their oysters, or raise them in controlled pH tanks until their tiny thin shells are thick enough to resist the acidic corrosion. Those very microorganisms, corals, and mollusks which effectively trap carbon to create shells or exoskeletons, and over time have created limestone, are now having a very difficult time forming their calcareous shells or branches due to oceanic pH shift. ![]() The problem with the acidification in the oceans, due mostly to atmospheric CO2, is that it has the potential for super-additive increase. Most of this acid comes from decaying vegetation. ![]() Carbonic acid - I was retouching a print today of a dawn shot of a marble cliff in Kings Canyon, taken two weeks ago, where over 240 caves have now been identified.
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