trypan blue(redirected from Congo blue)
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trypan blue(ˈtrɪpən; ˈtrɪpæn; trɪˈpæn)
(Biology) a dye obtained from tolidine that is absorbed by the macrophages of the reticuloendothelial system and is therefore used for staining cells in biological research
[so called because it is trypanocidal: see trypanosome, -cide]