Going by what i was told by a developer from FunCom (age of conan, the secret world, anarchy online etc.) some time back in response to a request for pure black and white clothing on characters, you will find similar issues in most game engines, apparently it's because pure white and pure black are mask colours in most shaders/renderers, so if you try to use pure black or white in game engines you get strange effects like that, whether it's still true or not i don't know this was years ago, i also remember a dev mentioning similar on the EverQuest and Star Wars Galaxies forums around that time too.
[img]belidos3d.swgrp.co.uk/wp-content/uploads/2016/03/blogo.png[/img]
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