I was looking for information about Ilfotec on the search and in one of the posts somebody told about this dilution:
Is this right? Because I have being diluted 1+31 straight from the bottle to develop my negatives and the results seems to be fine.[...] Ilfotec comes as thick goop. You have to mix it 1:3 with water to get stock. Then you dilute the stock to 1+31, 1+47 etc.