The use of the black dye can be limited to a small number of cells or to more extensive groups; occasionally one may even obtain a comprehensive view of an entire area of the central nervous system.

使用这种黑色染料我们可以将染色局限在一小部分的细胞和它们的衍生部分；运气好的话，我们甚至可以获得对于整个中枢神经组织的完整视野。