The worst is that it seems that only the albino is alive of those Paphiopedilum nigritum, maybe 1 or 2 colored individuals more worldwide. They were a callosum/barbatum related species that was found in large quantites out of Sarawak in the late 80s to early 2000s. Many went to Japan back then, if not nearly all. It is definitely not a synonym of barbatum.
One can find a few photos of the coloratum ones on the Japanese websites.