Well in all honesty you cannot make black with light and you cannot make white without light.

You can mix all three primary colors in equal parts and you get dark brown. Add a little blue you get a psuedo-black. This is why a black shirt sometimes looks blue or grey in the light. Think about it, if you out anything black in the sunlight, it's grey or blueish, not black. Only by removing light at various degrees doesn't look black.

If you mix red, blue, and yellow disproportionately you can get an almost white, but its more of a light grey. Depending on the ambient light in the room, you can painstakingly make subtle adjustments until you get what appears to be white, however, if you adjust the light in the room or take it outside, it'll look not white.

Think about that, look around you at anything you think is white. It's not white, its slightly shaded whatever color the ambient light in the room is. In a regular house light, it's slightly yellow, in an office its slightly blue. As opposed to black, only by adding light will it look truly white.

Here's an example if additive color mixing:

https://youtube.com/watch?v=kEnz_3miiAc&feature=shares

Additive color mixing is adding light, subtractive color mixing is removing light.

In reality however black is the absence of color because with the absence of light comes the absence of color. Contrarily, white is the presense of all color simultaneously. If the light is bright enough, it'll make any color look white.

Take a super bright white light and shine it on a black surface and what do you end up with? A white spot.

As far as why adding black to white is more dramatic than adding white to black that is because when you add black to white you instantly being absorbing photons, taking light away. However when you add white to black, you are merely reflecting photons that are already there, you're not adding anymore light. The Universe is only 0.005% photons so black is overly dominate.

Simply put it takes more energy to overcome the dominate factor.

That said, technically we're all a shade a brown, even albinos, which means we all share a dominate color of RED.

My apologies for drawing away from your point.