C-41 compounds:
Color Developer: The color developer contains a mixture of aromatic primary amines, such as p-Phenylenediamine (PDA) or Metol, and other chemicals. These compounds help to reduce the exposed silver halides and form metallic silver, while also activating the color-forming couplers in the film.
Preservative/Stabilizer: A preservative or stabilizer, often a compound like sodium sulfite (Na2SO3) or hydroxylamine sulfate (NH2OH·H2SO4), is added to the developer to prevent oxidation and maintain the stability of the working solution.
Alkali: An alkali, typically sodium carbonate (Na2CO3), is used to maintain the appropriate pH level of the developer solution, ensuring optimal development and color balance.