Test Tube black outline icon
Outline capped test tube with bubbles in the liquid inside a circle
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About the Test Tube black outline icon
A round-bottomed test tube with a thick stopper cap holds a liquid sample, with three bubbles rising in a diagonal line through it, framed by a thin circle. The bubbles read as an active reaction rather than a static vial. Good for laboratory service pages, chemistry lesson material, medical sample tracking, research reports and science app navigation.
The heavy cap anchors the top of the tube and balances the rounded base, while the circular frame matches other badged icons in the set. It pairs naturally with microscope, flask, dropper and DNA icons. The bubbles are small, so keep it at 40 px or above in interfaces.
This is the black outline version of the test tube icon: even, monoline strokes that stay crisp at small sizes and suit clean, minimal interfaces, wireframes and light backgrounds.
Get it free as an SVG vector or transparent PNG (16-512px), copy the SVG code, or restyle it in the free online editor — recolor any part, add gold, neon or gradient effects, animate it, or export EPS, PDF and DXF.
Free for personal and commercial use with attribution.
