Just for the records, one can mix a sodium citrate based kallitype developer buffered at pH levels 6 or 7.

See below:

  • pH 6: 200g trisodium citrate dihydrate + 20g citric acid monohydrate
  • pH 7: 200g trisodium citrate dihydrate + 2.6g citric acid monohydrate


(Amounts for 1000ml developer...)

Worked it out using this site.

Regards,
Loris.