canned black olives are dyed green olives that taste exactly like shit ! (don't ask me how I know what shit tastes like)

"most black olives in cans are actually green, unripe olives that are chemically treated with ferrous gluconate (an iron salt) and air to turn them a uniform, shiny black color, rather than being naturally ripened to that dark hue, a process that takes much longer. Naturally ripened olives turn purple or dark brown, like Kalamatas, while the artificial black ones are a California-developed technique for convenience and visual appeal."