So, firstly, I should note that this is a recipe developed for dark chocolate loaded black cocoa brownies. That said, I know that dark chocolate isn't for everyone and you also might just not have it in the cupboard! You can make this recipe as written substituting the black cocoa for normal cocoa and using semi-sweet or even milk chocolate in the mix. Black cocoa is not itself any more of a 'dark chocolate' than other cocoas - it is deeply colored because of the alkalizing process.