棕黑色

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

"矿:一种光亮的色土矿石,主要由铈、铒、钛、铀和钇构成."

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

结果肌梭赤道部与两极部神末梢呈色，清晰可见，梭内肌纤维染为黄色。