Test Tube Emoji

A clear glass test tube, open at the top, filled with what's almost always a bright green liquid. 🧪 is the emoji version of the most recognisable piece of lab glassware on Earth, and one of very few tools whose modern form barely changed in 200 years. The tube itself was standardised in the early 19th century, with both Jöns Jacob Berzelius (1814) and Michael Faraday (1827) credited with describing small glass tubes for bench-scale reactions. Before that, chemists experimented in wine glasses.

The emoji was approved in Unicode 11.0 (2018) as part of a larger science batch pushed through by the American Chemical Society and General Electric, alongside 🧫 (petri dish), 🧬 (DNA), 🦠 (microbe), 🥼 (lab coat) and 🥽 (goggles). The design choice that matters most: nearly every vendor paints the liquid inside bright green, even though most real lab chemicals are colourless. That colour is a visual shortcut lifted straight from decades of mad-scientist movies, where 'science is happening' is signalled by a glowing, sickly green glow. Scientific accuracy lost; visual recognisability won.

Online, 🧪 has grown well beyond chemistry class. Product teams use it for A/B tests and experimental features. Growth marketers use it for 'new product launches'. Cooks use it for kitchen experiments. And everyone uses it metaphorically when they want to say 'I'm trying something', which is most of the internet most of the time.

Science and STEM education. Biology teachers, chemistry professors, university outreach accounts, science-YouTube channels. The default 'lab content incoming' emoji. Often paired with 🔬 for research or 🥼 for the full scientist cosplay.

Tech and product. The clearest non-literal use. In Slack and GitHub, 🧪 signals A/B tests, feature flags, beta launches, and cautious production rollouts. 'Testing in production 🧪' is now unironic standard ops vocabulary, not just a meme. Growth teams use 🧪 in experiment tickets; ML engineers use it for training-run flags.

Beauty and skincare. 'Lab' and 'clinical' are marketing levers in skincare, so indie brands and beauty creators use 🧪 to signal 'serum' or 'active ingredient' or 'my apothecary era'. Common in DIY oil and essential-oil content.

Mad-scientist aesthetic. Halloween posts, Breaking Bad references, anime alchemy, Stranger Things fan content, cosplay photo captions. 🧪💥 is the universal 'experiment gone wrong' meme.

Relationships. 'Chemistry' memes. 'Testing the vibe 🧪', 'is this chemistry or just caffeine 🧪', dating-app hot-takes, couple compatibility quizzes. Less popular than 💕 but more popular than 🔬.

The test tube is a surprisingly recent piece of glassware. Before the early 1800s, chemists and alchemists worked with flasks, retorts, and whatever wine glasses were handy, and the 'small glass tube open at one end' didn't really appear in chemistry sets until the 19th century. JSTOR's history of the test tube traces two candidates for inventor: Jöns Jacob Berzelius, the Swedish chemist who described a boiling-tube precursor in 1814, and Michael Faraday, who sketched small test-reaction tubes in his 1827 book Chemical Manipulation. Neither claimed invention; both described tubes as if they were already in casual use.

What the test tube changed was scale. Glass is transparent, cheap, easy to wash, and lets you run a reaction in millilitres instead of litres. That made 19th-century chemistry repeatable and visual. It's why school chemistry looks the way it does: racks of cylinders, a pipette, a burner. The test tube is the reason science class has a look.

The emoji trailed that history by almost two centuries. In 2016, a working group co-sponsored by the American Chemical Society and General Electric proposed a set of lab emojis to the Unicode Consortium. They argued that science communication had no icons beyond 🔬 (microscope, 2010) and ⚗️ (alembic, 2005). The Unicode technical committee approved test tube, petri dish, DNA, microbe, lab coat and goggles together in 2018. Vendors rendered each one, and almost every vendor chose to fill the test tube with a bright green liquid. TV Tropes calls this Technicolor Science: real lab chemicals are mostly colourless, but on screen they have always glowed, so that's what 'science' looks like in an emoji too.

Approved in Unicode 11.0 (2018) as U+1F9EA TEST TUBEU+1F9EA TEST TUBE. Added to Emoji 11.0 in 2018. Part of the 2016 American Chemical Society-backed proposal that also produced 🧫, 🧬, 🦠, 🥼 and 🥽. CLDR short name: 'test tube'.

1. 2018Unicode 11.0 approves U+1F9EA TEST TUBE. Apple, Google, Samsung and Microsoft all launch colour renders.
2. 2018Apple iOS 12.1 renders the tube slightly angled with green liquid and a bubble suggesting fizzing. Becomes the default mental image.
3. 2019Samsung opts for a darker, more teal liquid. Google Noto keeps it bright. Microsoft Fluent uses cyan-green.
4. 2021WhatsApp redraws to match Apple's green; Facebook simplifies to a flatter two-tone.
5. 2023Microsoft 3D Fluent publishes a glossy, rounded test tube. Used heavily in Teams classroom backgrounds during hybrid-learning posts.
6. 2024Most platforms converge on bright green liquid. Samsung is the outlier, still leaning teal.

• •The test tube is a 19th-century invention, not an ancient one. Jöns Jacob Berzelius described a boiling-tube precursor in 1814, and Michael Faraday sketched small test-reaction tubes in his 1827 book Chemical Manipulation.
• •Before test tubes existed, chemists often ran small reactions in wine glasses. The switch to purpose-built glass tubes is one reason 19th-century chemistry accelerated so quickly.
• •Nearly every platform renders 🧪 with bright green liquid, but real lab reagents are usually colourless. The choice comes from movie mad-scientist iconography, not chemistry textbooks.
• •The emoji was pushed through Unicode by a 2016 proposal co-sponsored by the American Chemical Society and General Electric, making it one of the few emoji with an industrial R&D backer.
• •In tech companies, 🧪 has become functional vocabulary for experimental features. LaunchDarkly, Optimizely and internal feature-flag platforms commonly use a test-tube icon in their UI, and Slack channel names like #lab#lab and #experiments#experiments tend to show 🧪 in their topic.
• •Breaking Bad) turned 'chemistry teacher' into one of the most recognisable character archetypes of the 2010s. Walter White's Heisenberg alias references Werner Heisenberg, the physicist behind the uncertainty principle. 🧪 is the Heisenberg meme emoji by default.
• •The 'your honour my client was simply cooking 🧪' tweet format, adapted from Breaking Bad, remains one of the most reliable test-tube meme templates on X in 2025.
• •Vendors disagree on the angle of the tube: Apple shows it angled left, Google shows it nearly vertical, and Samsung used to show it tilted right. The green liquid is the one element they all kept the same.

• •Breaking Bad (2008-2013)) made the chemistry teacher one of the most iconic TV archetypes of the 21st century. Walter White's blue-meth crystals turned 🧪 into the default Heisenberg meme emoji.
• •Stranger Things Hawkins Lab flashbacks defined the 'retro mad science' aesthetic for a generation. Season 4 (2022) drove a summer-long spike in 🧪💥 captions.
• •Dexter's Laboratory (1996-2003) is still the most recognisable child-scientist cartoon. Its iconography, glowing liquids, sparking Tesla coils, white coats, matches how 🧪 is used online almost exactly.
• •Fullmetal Alchemist and My Hero Academia use test-tube imagery in key lab scenes. The 🧪 emoji is standard shorthand in Japanese anime fan accounts for either franchise.
• •Jekyll and Hyde (1886) is where the literary mad-scientist archetype starts. Modern 🧪-with-glowing-green visuals trace directly to 1930s film adaptations of Frankenstein and Jekyll.
• •The 'your honour my client was simply cooking' tweet format, a Breaking Bad callback, remains one of the most durable 🧪 meme templates on X.

• •🧪 is U+1F9EAU+1F9EA. Common shortcodes: :test_tube::test_tube: (Slack, Discord, GitHub).
• •In product UI, treat 🧪 as a universal signifier for 'experimental', 'beta', or 'feature flag'. Users have pattern-matched this across LaunchDarkly, Optimizely and internal tooling.
• •Colour-wise, platforms converge on bright green liquid. If you're designing a lab-themed icon set to match 🧪, default to a green fill rather than blue or red.

See the full Emoji Developer Tools guide for regex patterns, encoding helpers, and more.