Good morning.
Some years ago Ilford used to print on their fact sheets a chart of the developing times vs. re-use of the stock solution. The chart was similar to the common one of developing times vs. temperature, only the diagrams were not lines but curves. It was easy to read and didn't require mnemonic calculations (adding 40% at 5th film, etc.).
I have one of these charts glued to a bottle which proved impossible to scan, and I can't find anymore the original fact sheets from which I xeroxed it years ago. Does anyone perhaps also have this chart and could kindly scan it? Thank you very much.