Test Tube Bubbles black filled icon
Outlined test tube with a stopper cap, liquid inside and bubbles rising from the top
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About the Test Tube Bubbles black filled icon
A round-bottomed test tube topped by a wide rectangular stopper, filled to a wavy liquid line with round bubbles inside the glass and three more escaping above the cap. It reads as an active reaction, a sample under analysis or a blood test in progress. Fits laboratory dashboards, clinic booking flows, diagnostics reports, chemistry lesson slides and science app onboarding.
The tall narrow body sits under a cap that is noticeably wider than the tube, giving the shape a stable top-heavy profile, and the bubbles vary in size to suggest motion. Pair it with microscope, flask and syringe icons; at small sizes the escaping bubbles are the detail to protect.
This is the solid black filled version of the test tube bubbles 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.
