Are we looking at bleached vs. unbleached?
The issue is not color, it's porosity, and that can happen whether or not it's bleached (supposedly done in gasoline...glad I don't work there in China where it mostly all comes from...). Quality, not color is the issue, and you can't tell that from a photo on-line. I get mine from SAGA, and I don't have to reject much. Stewart MacDonald or Luthiers Mercantile are great sources. Don't necessarily buy based on the lowest price; your shipping will be as much as the bone. Get good stuff from a reputable supplier. Then, of course, you have to shape and fit it.