#bone color

Well, that white color that you’re used to is probably a product of the care taken by the collector to degrease the bone. This generally involves a soak in a water-diluted bath of hydrogen peroxide, possibly followed by a soak in a mixture of water and liquid soap. However, sun-bleached bones can also get the white coloring. As for why the crab eater seal skull is a more yellowish color is just that it was not fully degreased, or it could also be the product of how the bone was processed. Manure, which is one method of removing soft tissue from bone, can leave a bit of color.