Hi. I'm interested in trying out FX-2, however I don't have any of the potassium carbonate crystals on hand. However, I saw the formula listed online at Jack's Chemistry site:
where a "K" variant is mentioned at the bottom:
"Replace the potassium carbonate with 225 g Kodalk (sodium metaborate). This variation, FX 2K, provides more flexibility with enhanced midtones."
Its my understanding that Kodalk and sodium metaborate are NOT the same thing. Has anyone tried this variant? My first edition Film Development Cookbook doesn't mention it. Is this legit? And is it Kodalk or sodium metaborate?