Originally Posted by
Michael R
Mixing your own ascorbate developer without a strong iron/copper chelating agent isn’t the best idea. You really need DTPA (which XTOL, XT-3 etc. contain). It is obtainable but expensive. Ryuji Suzuki had a workaround for DTPA using salicylic acid and TEA. Alternatively you can most likely get away without DTPA if you mix what you need immediately before use, although that’s not a guarantee.
The Zawadzki patent formula is extremely close to, if not exactly XTOL - at least up until several years ago when the packaged formula replaced metaborate with borax.
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