Adjust
For the times the table doesn't cover: a warm bath, a long exposure, an odd tank, or when you just want a clock that says when to invert.
A starting point. Test a roll.
The reciprocity tool uses Ilford's published formula and factors. The temperature tool uses a rule I fitted to Ilford's chart examples, not a published formula, and it's only meant for 14–24 °C. Check the current datasheet.
Temperature
—minutes : seconds
Long exposure
—corrected exposure
Ilford: corrected = meteredP. How it works.
Dilution
—
Your tank's required volume is printed on it or in its instructions.
Tank timer
0:00
Ready
Cues follow Ilford's pattern: invert four times in the first 10 seconds of every minute.