Racism doesn't change the skin color of the recipient, however.

Kamala Harris is factually Black, and she is factually South-East Asian. Your perception of her skin tone means nothing.

Colorism is a pretty old form of racism - typically perpetrated inter-culturally / within the same ethnicity, or more recently by white supremacists to categorize minorities or other white ethnicities - which tries to define someone as definitively outside of a ethnic group they factually belong to.