Ilford's official guide is at:
http://www.ilford.com/html/us_english/pdf/HP5_Plus.pdf
Unlike Delta they do not give a lot of information for lower EI ratings on
HP5.
The only recommended time is for Perceptol (full strength) which goes from 11
minutes (EI 400) to 9min at 20C at EI 100.
(For EI 200, time is same as EI 400. )
Tim Hughes
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