Underveloping Negatives by 2 stops ON Purpose

Yes I want to.
High key....zone vii and vi.

I shoot over by 2 stops then when I develop I under develop by 2 stops.

HOW?

Do i increase temp..dont like that..too ify

Do I reduce minutes? say standard time for the developer and film/iso im using is 6.5 minutes
do I now only develop 4.5? 5.? 5.5? to achieve the 2 stops under.

Many thanks...

What are your tools? Film? Speed? Format? Developer? Temperature normally used? Need help, please provide info. We'll help.

Delta 100/35mm ID-11mixed 1to1 metal can & reel
overexposeed every shot by 1 or 2( 2 recommended for the high key images.)

reg develop for 100iso is 11 minutes/68degrees

I would reduce it to 9 minutes and go from there. Seems like a more or less standard procedure from the outset. Time is the first adjustment that should be made IMHO.

Oh, and welcome to APUG.

Is this what you want? To develop film that has had 2 stops extra exposure so that the negative densities corresponding to Zones VI and VII are the same as normally exposed and developed film. If so try giving half the normal development time, inspect the result, and make further adjustments from there.

If your objective is to make high key photographs of ordinary subject matter by changing exposure and development then you are unlikely to succeed. High key pictures depend strongly on having actual high key subject matter. Given that, ordinary exposure and development works fine.

Got the subject matter all ready in high key...
Gathered it over the course of the last year.
Everything covered except for the development time...

How to Underdevelop

Increase dilution while holding to the
same development time. Perhaps
1:3 one-shot will do. Dan

how do you plan on printing these images ?
if you have the ability to deal with long exposure times
i would ( and have ) been in your situation, and i over developed
the film (or at least developed it by the "normal" developing time + a minute for good luck ) .
good luck!
john