Final answer:
The two-step blonding process consists of prelightening the hair and then toning it to achieve the desired blonde shade. Permanent hair coloring changes the hair structure chemically, while semi-permanent coloring fades over time.
Step-by-step explanation:
The blonding process where the hair is prelightened and then toned with a toner or glaze is also known as the two-step blonding process. In the first step, chemical lighteners or bleach are used to remove natural pigment and lighten the hair. The second step involves the use of a toner or glaze to add the desired tone to the prelightened hair, creating the final blonde shade. Permanent hair coloring involves the use of an oxidant and a coupling agent to create a permanent color change, whereas semi-permanent hair color does not lighten hair and will fade over time. Temporary coloring can be achieved with rinses that wash out with shampooing, and plant-based dyes like henna provide a more natural approach to altering hair color.