Quote Originally Posted by Ryuji View Post
Despite your observation, formula like this is very intolerant of small errors and performance will be very much variable in practical situations.
Yes, an error of just a few hundreths of a gram of the phenidone will cause a substantial change. But an error of a gram of sulfite will make no perceivable difference, and I've verified robustness in the ascorbic acid. Further testing is needed to gauge sensitivity to type of water (if distilled/DI isn't used), temperature, dilution, and film-type.

And I forgot to mention this recommendation: Dissolve the sulfite first, so it'll scavenge the dissolved oxygen.

Quote Originally Posted by RidingWaves View Post
Great! Any idea what the conversion to Dimezone-S would be since I have that on hand...
I suggest 0.2 g of dimezone-S, because that's what XTOL uses. Others have changed this to 0.15 g of phenidone in XTOL-like formulae, so 0.2 g dimezone-s should be very close.

Mark Overton