I didn’t know Mexican could have black in them. Thought it’s more of a Cuban thing.
The vast majority of Mexican Mestizos have black blood, but less than 10%.
The Criollos/White Mexicans don't really have any black blood, sometimes only 1%, & that's it.
Indigenous Mexicans or Mexican Amerindians usually don't have black blood, but it's more common for the Indians to have black blood, instead of the Whites in Mexico.
Basically it's the Mestizos with the black blood, besides the Afro-Mexicans.