Final answer:
c) Para phenylenediamineThe ingredient common to semi-permanent, demi-permanent, and permanent hair color formulations is Para phenylenediamine. This compound is crucial in the oxidation process that leads to the formation of the dye within the hair fiber.
Step-by-step explanation:
The ingredient found in semi-permanent, demi-permanent, and permanent haircolor is c) Para phenylenediamine. This compound is part of the oxidation dye process used in permanent hair coloring, which typically consists of three components: an aromatic amine like para phenylenediamine, a coupling agent, and an oxidant. The process leads to the oxidation of para phenylenediamine to the quinone state, which then reacts with a coupler compound, and a final oxidation step that forms the dye which imparts color to the hair. While ammonia is commonly found in permanent haircolor to create an alkaline environment that opens up the hair cuticle, it is not an ingredient that is found across all types of haircolor formulations such as semi-permanent and demi-permanent.
The ingredient that is found in semi-permanent, demi-permanent, and permanent haircolor is para phenylenediamine. This compound is commonly used as a dye in haircolor products due to its ability to produce a wide range of colors. It is a key component in the oxidation process that occurs during permanent hair coloring.