Reading down the thread I was thinking 'Which version of APX 100 and how old?' Not that it matters now that @Barney has negatives processed.APX100 is allegedly Kentmere 100 re-badged. MDC has a time of 5:75 for K100 in HC-110 dilution B (1+31), but note that the temp is 22C. I use a time of 6m 30 for K100 in dilution B, and it seems to work fine.