Citracinic acid reacts as competitive colourless coupler in the higher Densities of the slide in order to reduce the D max. or control the Contrast. This means if you take more Citracinic acid the contrast will decrease, this can be a benefit for reproductions.
If you want to start homebrewing this ingredient can be skipped eventually, if otherwise the option is to toss the whole project…In my Chromebrews I reduced it’s amount about 50% to 0.6g / Litre. for increasing the contrast a bit. That worked fine for me, but to be honest I’ve never thought about substitutes (it will be tricky because of the nonlinear effect)
Maybe sulphite, but this will effect more or less all densities, not only the higher ones, or more silver soluble agent but this will pronounce a loss more in the lower densities...
Last edited by stefan4u; 02-20-2012 at 07:46 PM. Click to view previous post history.
Stefan has it correct. Substitutes are "H Acid" and "J Acid". I have no idea of the substitution ratios, nor if they are exactly identical. Citrazinic acid also controls grain as well as contrast. It can have some effects on sharpness as well.