Test Tube Bubbles black outline icon
Test tube holding liquid with bubbles rising out of it, framed in a circle
About the Test Tube Bubbles black outline icon
A round-bottomed test tube with a wide rim cap holds liquid up to a wavy fill line, with bubbles floating inside the sample and escaping above the mouth. It reads as a laboratory sample, a blood or chemistry test and an experiment in progress. Fits diagnostics apps, hospital and clinic sites, science lesson material, research reports and pharmaceutical packaging.
The tube is centered inside a thin circular badge, so the shape works as a stand-alone mark or as a button. Bubble circles vary in size to suggest motion. It sits well beside microscope, flask and pill icons; use 32 px and up so the bubbles stay separate.
This is the black outline version of the test tube bubbles icon: even, monoline strokes that stay crisp at small sizes and suit clean, minimal interfaces, wireframes and light backgrounds.
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.
