Black Cocoa powder, sometimes called black onyx powder, Dutch cocoa powder, or European style powder, is a pure cocoa powder specially processed to achieve a rich dark color. It has a lower acidity than natural cacao powder, which lets the strong chocolate flavors come through. However, having a lower acid content can affect its interaction with other ingredients, so sometimes a direct substitution between natural cocoa and black cocoa is not possible, or minor adjustments need to be made to the recipe for the chemistry of the dish to remain balanced.
Hahah - for future reference.
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