Test Tube black filled icon
Outline capped test tube with bubbles in the liquid inside a circle
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About the Test Tube black filled 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 solid black filled version of the test tube icon: a bold silhouette that reads clearly at 16-24 px and on dark or busy backgrounds, and prints well in one colour.
It downloads free as an SVG vector or transparent PNG in seven sizes, and the free online editor lets you recolor it, apply gold, silver, neon and gradient styles, add animation, or convert it to EPS, PDF and DXF.
Free for personal and commercial use with attribution.
