I'm looking at the Massive Dev Chart website. It shows a table like this:

Enter image description here

What's the meaning of stock dilution there? How should we prepare the developer on that condition?

  • 2
    Seeing this on the "Hot Network Questions" list, I thought it was about dilution of stock investments that happens e.g. in companies offering generous stock options, and only then I noticed the photography logo...
    – juhist
    Jul 2, 2019 at 9:56

2 Answers 2


Jargon of photographic chemical mixing and preparation:

  • Concentrate — Chemical that comes bottled in kits and must be diluted.
  • Stock Solution — A chemical that has been mixed from concentrates or powdered formula. This solution must be diluted with water for use.
  • Working Solution — Photo chemicals at the correct concentration for use.

As a rule of thumb — concentrates and stock solutions have prolonged shelf life. A working solution has greatly reduced shelf life.


'Stock' means 1+0: don't dilute the dev at all, just use the stock solution you made up.

  • 4
    So glad it doesn't require boiling chicken bones.
    – xiota
    Jul 1, 2019 at 10:41
  • 4
    @xiota: surely you always add chicken bones to your dev? Vastly improves the results I find. In fact I'm experimenting with leaving out the dev altogether and just using boiled pig trotters...
    – user82065
    Jul 1, 2019 at 10:50
  • 3
    Now I remember why I use digital...
    – xiota
    Jul 1, 2019 at 10:56
  • 1
    @neversaint how to control for temperature would make a great next question!
    – OnBreak.
    Jul 1, 2019 at 16:43
  • 1
    @neversaint If your stock chemicals are not at the temp you need you can place them in a water bath to raise or lower the temp accordingly. If you want to raise the temp of the stock solution then get a container that is larger then the one the stock solution is in and fill it with HOT water, place the sealed container that the stock solution is in into the water, Now you have sealed bottle of stock solution floating a hot water bath. Check the temp of the stock solution every so often to monitor its rise in temp. Smaller amounts will warm up quicker. Ice bath to lower temps.
    – Alaska Man
    Jul 1, 2019 at 21:15

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