棕黑色

"euxenite:a lustrous, blackish-brown rare-earth mineral consisting primarily of cerium , erbium, titanium, uranium, and yttrium."

"黑稀金矿:亮的黑色稀土矿石,主要由铈、铒、钛、铀和钇构."

Results Nerve endings of muscle spindle in equatorial and polar regions were dyed black;intrafusal fibers were dyed buffy.

结果肌梭赤道与两极神经末梢呈黑色，清晰可见，梭内肌纤维染为黄色。