> sodium sulphite decrease sharpness?(posted 8807 days ago)25g/L isn't enough to have any visible effect on sharpness.
I'm currently using 20g/L sodium sulfite for HP5+ in Rodinal 1:50; I've used up to 50g/L with no visible effect that I've been able to see even with a 30X magnifier.
What it does is raise the EI for that combination to EI 320 rather than EI 200 for the same CI.