Potassium Ferricyanide, or now with this new FPP kit bleach), you must at least provide a good wash between bleach and fixer. If you have lots of sodium or potassium in your bleach (e.g.
Obviously this does not affect performance of bleaches, but it does affect BLIX and fixer. This effect is most pronounced for potassium, but it also happens with sodium, whereas ammonium ion does not suffer from this. This means, if you have certain alkali ions present in high amounts, even relatively small quantities of silver halides will form these mixed salts and thereby end the useful life of fixer.
There are mixed salts of alkali ion, silver, halide and thiosulfate, some of which are very poorly soluble. In other words: Cinestill's BLIX may be just as fast as a BLIX mixed from mostly ammonium salts. There are studies, which require no more than 50% ammonium ions to reach optimum speed, this is how Sodium Thiosulfate based fixers gain their speed. Larger cation/hydration clusters move slowlier through gelatin, therefore from this point of view you want predominantly ammonium or maybe potassium (more on those later) ions in your solution. If you look at ion size in hydrated form, you have Li + > Na + > K + > NH 4 +. Click to expand.There are some disadvantages to having lots of sodium in your bleach/BLIX:
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