Hello In my country Kodalk (sodium metaborate) isn't available for purchase. I know what kodalk can be replaced with borax+NaOH and sometime I used this. But now I want find other solution for buffer with same pH, because I don't like working with NaOH. I found that carbonate-bicarbonate isn't good for kodalk replacement because optimal pH range for this system is 9.5..10.5. Other possible substitution is DEA with pH in range 10.5..11.5. Maybe mixture of TEA+DEA will be good buffer in range 10..11. In Anchell "Darkroom Cookbook" I found next recomendation for substitute kodalk: I haven't found any details in google about carbonate-borax buffer, just only that such type of buffer used for pH in range 10-11. Someone try this?