Indeed, whilst Pure Black and Pure White, in their current iteration, had a few fringe uses, they were rather limited, hence why they were restricted.
With this patch, we'll be able to open those two new colors up to everyone. The black is a much darker shade of black, and the white is closer to gainsboro.
In the original poster's example, even with pure black, people could see the outline of the face. That hood, unlike the "original" one, isn't a blank face.