Final answer:
On-the-scalp lightener does not darken the natural pigment, it lightens it. It comes in oil and cream forms and has a pH of around 9.
Step-by-step explanation:
The statement which is NOT true about on-the-scalp lightener is that it darkens the natural pigment. On-the-scalp lightener is a chemical product used to lighten hair and it comes in oil and cream forms. It possesses a pH of around 9. When applied, it works by lightening the natural pigment in the hair, resulting in a lighter shade.