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A little help with pushing HP5+


I' l have to try this, but I' m not used to stand development. So to make it clear:
Do you invert for 1 sec every 30 minute for 2 hrs? for practical use; turn the thank upside down once and put it down again?
- And the temperature? 20 degree C?

Thanks.
 
I have had good results using D76.
 
Iv just shot of a few rolls of HP5 at 3200 and am digging for info on developing it.
For this, I use Ilford's recommendations.
400 to 3200 (in 6400) Ilford Microphen stock solution at 20 ° C

What is ment by (in 6400)?