I would assume colour crossover from the interlayer effects not being present. Otherwise if they're present.. then it'd just be mismatched curves, not under correction of colour crossover in the masking (ie: Not the green portion having exposure from blue and/or red in it).
If you're correcting digitally, then a Xrite ColorChecker Passport will cure what ails you, but it's best of course to start off with the best source.
Add a few mg (1-1.4mg per litre - in reference to this formula - http://www.apug.org/forums/forum40/5...-near-c41.html ) of Potassium Iodide to at least part B (though you would likely want it in both parts) of Dignan's formula, skip the Benzotriazole. HAS is important in working solution developer as a preservative, and to keep replenishment rates low. So it may not be needed, though I would recommend some in part A to prevent excess fog. There are many suppliers of CD-4 in China. Check to see what acid salt they supply though, that'll change your mix ratios.
The Sodium Sulphite present activates at least some of the CD-4 in my experience (3.5g from calculation if using the H2SO4 salt of CD-4), iirc it's
H2SO4 + Na2SO3 -> Na2SO4 + H2O + SO2
98.079g + 126.043g
Some people skip the sulfite and find they got thin to no images. Having the developer activate only in bath B is not good enough, at least a thin image must form in Bath A for this to work reasonably.
You can replace the 4.5g of Sulfite with 9.5 grams of Sodium Bicarbonate to activate all CD-4 (H2SO4 salt), and then set the desired pH with sodium metabisulphite.
Last edited by Athiril; 02-08-2013 at 12:36 AM. Click to view previous post history.