Now, with the top on the tank, developing can be carried out in the light.
Chemicals are poured in and out through a light baffle under the small lid. The
tank is normally inverted several times each minute to agitate the developer for
more even results. For the first 30 seconds or so, the tank may be thumped against
a solid surface to cause any trapped air bubbles to break loose and float away.
The two measuring cups on the right contain stop bath and fixer to finish the process.