Look at the color
1. The color of natural cocoa powder should be light brown. For brown or even dark brown natural cocoa powder, cocoa peel or other food coloring must be added.
2. The color of alkalized cocoa powder should be brown-red. If it is dark brown or brown-black, it must be due to excessive alkalization and excessive ash content.
3. The color of cocoa black powder should be dark brown to brown-black. If the color of cocoa powder is pure black or even dark black, it means that food coloring must be added to the cocoa powder.