Potassium carbonate

Potassium carbonate - highly soluble alkaline accelerator used in most general purpose and print developing solutions.
Potassium chloride - chemical used in some bleaches and sensitizers.
Potassium citrate - chemical used in blue and green toners.

sodium hydroxide (common name caustic soda)
potassium hydroxide (potash lye)
lye (generic term, for either of the previous two, or even for a mixture)
sodium carbonate (soda ash)
potassium carbonate (potash) ...

Common accelerators used in developing solutions are sodium carbonate and potassium carbonate. Without an accelerator, there is little or no action. With some accelerators there is too much action.

Potassium carbonate - P
Potassium chloride - P
Potassium citrate - P
Potassium dichromate - P
Potassium ferricyanide - P
Potassium hydroxide caustic potash - P
Potassium iodide - P
Potassium metabisulfite - P
Potassium permanganate - P ...

See also: Carbonate, Potassium hydroxide, Yellow, Scale, Bromide