Okra can turn black when cooking due to a reaction between its natural pigments and certain cooking conditions. High temperatures, prolonged cooking, or exposure to acidic ingredients can cause the chlorophyll in okra to break down and lead to darkening. Additionally, the presence of iron in the cooking water or utensils can contribute to this discoloration. To minimize the color change, it’s best to cook okra quickly and avoid acidic ingredients during the process.
Okra that has black spots should not be eaten. Okra pods will be green and firm when they are fresh.
Rusting
They were frozen before. Previously frozen chicken bones turn black during the cooking process.
Mold
Gravitation.
Tulsi leaves turn black due to oxidation, which occurs when the leaves are exposed to air for a prolonged period of time. This process causes the leaves to lose their green color and turn black.
Brake dust!
Bugs are wiping their asses on them
Too much iron in the water
Alkaptonuria is an inherited condition that causes urine to turn black when exposed to air.
its hard to turn cooked pancakes back into batter
It is the high temp and the high return Pressure inside the injector that causes the fuel To turn black