A human hand, featuring fingernails with a multi-colored polish gradient, holds three clear glass test tubes diagonally in the foreground of a laboratory setting in Recife, Brazil

A human hand, featuring fingernails with a multi-colored polish gradient, holds three clear glass test tubes diagonally in the foreground of a laboratory setting in Recife, Brazil. The leftmost test tube contains a yellow liquid. The central test tube holds a dark blue liquid. The rightmost test tube contains a light blue liquid. All three tubes are partially filled. In the blurred background, a white test tube rack occupies the lower half, containing numerous clear glass test tubes; some are empty, while others contain small volumes of dark or faint yellow liquids. Further back, out of focus, are white laboratory containers, one with visible yellow-capped vials or test tubes, and another with a light blue lid. The overall environment indicates an indoor laboratory or clinical workspace.