I do both.
Originally Posted by Rafal Lukawiecki
I usually mix 2 litres worth of concentrate, and that's enough that I can measure Dimezone S directly using my .001 resolution scale. But for small tests, I use Dimezone S mixed with propylene glycol in a 2% solution like this:
Propylene glycol .......... 49 g (grams, not ml)
Dimezone S ................. 1 g
Then, to get X grams of Dimezone S into a developer, where X is a tiny number, I weigh 50X of that solution, which is much more accurate.