TIL
When I think about it remember wondering sometimes (when opening a new package of cocoa) why the new one had a different color than the old one. I guess I've been mixing dutch and natural all the time ^^'
Concerning the baking soda vs. baking powder I think there might also be other factors at play as, at least were I live, baking soda alone is nearly never used. So it might be sort of a cultural thing...
Isn't baking powder basically just baking soda with some acid in order to produce CO2 as it gets wet?