Fun fact: “Black olives, though labeled as “ripe” on supermarket cans, actually aren’t: these, a California invention, are green olives that have been cured in an alkaline solution, and then treated with oxygen and an iron compound (ferrous gluconate) that turns their skins a shiny patent-leather black.”
https://www.nationalgeographic.com/culture/article/olives–the-bitter-truth
It’s worth noting that there are naturally occurring “black” olives, but they tend to have a sort of purple hue, there are also sun dried black olives that are kind of wrinkly.
But those ink black ones you get on pizzas? Nah.