The Inkspot nebula (B86) is a tiny dark cloud in Sagittarius, which almost completely obsucres the background stars of Milky Way (5 out of 6 in opacity scale) - giving an impression of a spilled spot of ink (because of it's shape as well). It is one of the most impressive dark nebulae, though to observe it fairly dark skies are required. 

Ink spot - B86

A tiny beautiful dark cloud in Sagittarius

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