{"id":15953,"date":"2026-06-02T15:55:56","date_gmt":"2026-06-02T14:55:56","guid":{"rendered":"https:\/\/www.smithersofstamford.com\/blog\/?p=15953"},"modified":"2026-06-02T15:56:09","modified_gmt":"2026-06-02T14:56:09","slug":"what-gas-is-really-in-a-neon-sign-spoiler-its-probably-not-neon","status":"publish","type":"post","link":"https:\/\/www.smithersofstamford.com\/blog\/what-gas-is-really-in-a-neon-sign-spoiler-its-probably-not-neon\/","title":{"rendered":"What Gas Is Really in a Neon Sign? (Spoiler: It&#8217;s Probably Not Neon)"},"content":{"rendered":"<div class=\"sws_supernormalaction\"><button on=\"tap:superwebshare-lightbox\" class=\"superwebshare_normal_button1 superwebshare-button-large superwebshare-button-default superwebshare_prompt superwebshare_button_svg\" style=\"color:#ffffff;background-color: #1e73be;\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"superwebshare-svg\"  fill=\"currentColor\" viewBox=\"0 0 1000 1000\" stroke=\"currentColor\" stroke-width=\"0\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M789.86,323.67c91.79,0,164.25-72.46,164.25-164.25S881.64,0,789.86,0S625.6,72.46,625.6,164.25c0,4.83,0,14.49,0,24.15L306.76,371.98c-24.15-24.15-57.97-33.82-96.62-33.82c-91.79,0-164.25,72.46-164.25,164.25s72.46,164.25,164.25,164.25c38.65,0,72.46-14.49,96.62-33.82L625.6,821.26c0,9.66,0,14.49,0,19.32c0,86.96,72.46,159.42,159.42,159.42s159.42-72.46,159.42-159.42s-67.63-159.42-154.59-159.42c-33.82,0-67.63,9.66-96.62,33.82L374.4,526.57c0-9.66,0-19.32,0-24.15s0-14.49,0-24.15l318.84-188.41C717.39,314.01,751.21,323.67,789.86,323.67z\" \/><\/svg><span>Share<\/span><\/button><\/div><p class=\"ds-markdown-paragraph\"><span class=\"\"><a href=\"https:\/\/www.smithersofstamford.com\/neon-signs.html\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15566 size-full aligncenter\" src=\"https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/trending-neon-signs-instagram-quotes-best-sellers-uk.png\" alt=\"Most Instagrammed Neon Sign Quotes in 2026 The Neon Phrases Taking Over Bedrooms, Bars &amp; Instagram Walls\" width=\"1511\" height=\"885\" srcset=\"https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/trending-neon-signs-instagram-quotes-best-sellers-uk.png 1511w, https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/trending-neon-signs-instagram-quotes-best-sellers-uk-300x176.png 300w, https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/trending-neon-signs-instagram-quotes-best-sellers-uk-1024x600.png 1024w, https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/trending-neon-signs-instagram-quotes-best-sellers-uk-768x450.png 768w\" sizes=\"auto, (max-width: 1511px) 100vw, 1511px\" \/><\/a>When you hear the words &#8220;<strong>neon sign<\/strong>,&#8221; you probably imagine a glowing storefront \u2014 maybe a bright red <\/span><strong><span class=\"\">OPEN<\/span><\/strong><span class=\"\"> sign or a cool blue cocktail glass in a bar window. But here&#8217;s a secret that most people, and even some AI overviews, get wrong:<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Most &#8220;neon&#8221; signs contain zero neon.<\/span><\/strong><\/p>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Let me explain.<\/span><\/p>\n<h2><span class=\"\">The Short Answer (For the Impatient)<\/span><\/h2>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Red or orange glow<\/span><\/strong><span class=\"\"> \u2192 pure neon gas<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Blue, green, yellow, pink, white<\/span><\/strong><span class=\"\"> \u2192 argon gas + a tiny bit of mercury + a phosphor coating inside the tube<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">If you stop here, you already know more than most people. But if you want to understand <\/span><em><span class=\"\">why<\/span><\/em><span class=\"\"> \u2014 and why the Google AI overview is misleading \u2014 keep reading.<\/span><\/p>\n<h2><span class=\"\">What Google&#8217;s AI Says<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Here&#8217;s what Google&#8217;s AI overview currently says:<\/span><\/p>\n<blockquote>\n<p class=\"ds-markdown-paragraph\"><em><span class=\"\">&#8220;A neon sign is typically filled with either neon gas or argon gas (often mixed with a tiny drop of mercury). When electrified, neon glows bright red-orange, while argon produces a blue light. Other colors are created using tinted glass or by coating argon tubes with glowing phosphors.&#8221;<\/span><\/em><\/p>\n<\/blockquote>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">This isn&#8217;t <\/span><em><span class=\"\">wrong<\/span><\/em><span class=\"\">, but it&#8217;s like describing a car as &#8220;a metal box with wheels.&#8221; Technically true, but missing the interesting and useful parts.<\/span><\/p>\n<h2><span class=\"\">The Problem With &#8220;Argon Produces a Blue Light&#8221;<a href=\"https:\/\/www.smithersofstamford.com\/neon-gas-originals.html\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-15555 aligncenter\" src=\"https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/till-death-neon-sign-light.png\" alt=\"\" width=\"1536\" height=\"1024\" srcset=\"https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/till-death-neon-sign-light.png 1536w, https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/till-death-neon-sign-light-300x200.png 300w, https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/till-death-neon-sign-light-1024x683.png 1024w, https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/till-death-neon-sign-light-768x512.png 768w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" \/><\/a><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Pure argon, when electrified, does <\/span><strong><span class=\"\">not<\/span><\/strong><span class=\"\"> glow bright blue. It glows a very faint <\/span><strong><span class=\"\">lavender-gray<\/span><\/strong><span class=\"\">. You can barely see it in a lit room. So how do we get those brilliant blue neon signs?<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Mercury.<\/span><\/strong><\/p>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">By adding a microscopic amount of liquid mercury (which vaporizes when the sign runs), the argon-mercury mixture produces <\/span><strong><span class=\"\">ultraviolet light<\/span><\/strong><span class=\"\"> \u2014 invisible to humans. That UV light then hits a <\/span><strong><span class=\"\">phosphor coating<\/span><\/strong><span class=\"\"> on the inside of the glass tube, which converts UV into bright visible blue light.<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Without mercury and phosphors, you don&#8217;t get a blue neon sign. You get a disappointing purple-gray flicker.<\/span><\/p>\n<h2><span class=\"\">The Truth About &#8220;Tinted Glass&#8221;<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Google&#8217;s AI says other colors come from &#8220;tinted glass or coating argon tubes with glowing phosphors.&#8221;<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Tinted glass is <\/span><strong><span class=\"\">rarely used<\/span><\/strong><span class=\"\"> in professional neon signs. Why? Because tinting the glass <\/span><em><span class=\"\">absorbs<\/span><\/em><span class=\"\">light, making the sign dimmer and less energy-efficient. Instead, almost all non-red neon signs use:<\/span><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Clear glass tubes<\/span><\/strong><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Argon + mercury gas fill<\/span><\/strong><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Different phosphor coatings<\/span><\/strong><span class=\"\"> for different colours<\/span><\/p>\n<\/li>\n<\/ul>\n<div class=\"ds-scroll-area ds-scroll-area--show-on-focus-within ds-scroll-area--enabled _1210dd7 c03cafe9 _5ac647c\">\n<div class=\"ds-scroll-area__gutters\">\n<div class=\"ds-scroll-area__horizontal-gutter\"><\/div>\n<div class=\"ds-scroll-area__vertical-gutter\"><\/div>\n<\/div>\n<table>\n<thead>\n<tr>\n<th><span class=\"\">Desired Color<\/span><\/th>\n<th><span class=\"\">Gas Mix<\/span><\/th>\n<th><span class=\"\">Phosphor Coating<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span class=\"\">Bright red<\/span><\/td>\n<td><span class=\"\">Neon (only)<\/span><\/td>\n<td><span class=\"\">None needed<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"\">Blue<\/span><\/td>\n<td><span class=\"\">Argon + mercury<\/span><\/td>\n<td><span class=\"\">Standard blue phosphor<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"\">Green<\/span><\/td>\n<td><span class=\"\">Argon + mercury<\/span><\/td>\n<td><span class=\"\">Green phosphor<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"\">Yellow<\/span><\/td>\n<td><span class=\"\">Argon + mercury<\/span><\/td>\n<td><span class=\"\">Yellow phosphor<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"\">Purple<\/span><\/td>\n<td><span class=\"\">Argon + mercury<\/span><\/td>\n<td><span class=\"\">Purple phosphor<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"\">White<\/span><\/td>\n<td><span class=\"\">Argon + mercury<\/span><\/td>\n<td><span class=\"\">White phosphor<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2><span class=\"\">Other Gases You&#8217;ve Never Heard Of<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Neon and argon aren&#8217;t the only players. Here are the rare ones:<\/span><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Helium<\/span><\/strong><span class=\"\"> \u2192 glows soft gold\/pink (but expensive and hard to work with)<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Krypton<\/span><\/strong><span class=\"\"> \u2192 pale green (very expensive \u2014 almost never used commercially)<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Xenon<\/span><\/strong><span class=\"\"> \u2192 blue-white (extremely expensive; mostly for research or high-end art)<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">If you see a neon sign that claims to use krypton or xenon, someone either has too much money or is lying to you.<\/span><\/p>\n<h2><span class=\"\">A Quick History Lesson<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Neon was discovered in 1898 by British chemists William Ramsay and Morris Travers. They named it from the Greek <\/span><em><span class=\"\">n\u00e9on<\/span><\/em><span class=\"\">, meaning &#8220;new.&#8221;<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Just 12 years later, French inventor Georges Claude demonstrated the first neon lamp at the Paris Motor Show in 1910. By 1923, he sold two &#8220;neon&#8221; signs to a Packard car dealership in Los Angeles for $24,000 (about $400,000 today).<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Ironically, those first signs were <\/span><strong><span class=\"\">red<\/span><\/strong><span class=\"\"> \u2014 actual neon. But as the technology spread, sign makers realized they could get other colours cheaper with argon, mercury, and phosphors. They kept calling them &#8220;neon signs&#8221; because the name had already stuck.<\/span><\/p>\n<h2><span class=\"\">The Misleading Name Game<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Walk down any city street at night. Count the glowing signs:<\/span><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Red &#8220;OPEN&#8221; sign \u2192 likely real neon<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Blue &#8220;TACOS&#8221; sign \u2192 almost certainly argon\/mercury\/phosphor<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Green &#8220;EXIT&#8221; sign \u2192 argon\/mercury\/phosphor<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Yellow &#8220;PIZZA&#8221; sign \u2192 argon\/mercury\/phosphor<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">By some estimates, <\/span><strong><span class=\"\">less than 10%<\/span><\/strong><span class=\"\"> of commercial &#8220;neon&#8221; signs actually contain neon gas. The rest are imposters \u2014 but they inherited the name anyway.<\/span><\/p>\n<h2><span class=\"\">How to Spot a Real Neon Sign Without Breaking It<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">If you can&#8217;t open the tube (and please don&#8217;t), look at the color:<\/span><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><a title=\"Real Neon vs LED Neon: Which Is Better?\" href=\"https:\/\/www.smithersofstamford.com\/blog\/real-neon-vs-led-neon\/\" rel=\"\"><strong><span class=\"\">Real neon<\/span><\/strong><\/a><span class=\"\"> \u2192 pure red-orange. No other color.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Everything else<\/span><\/strong><span class=\"\"> \u2192 not neon.<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">There&#8217;s one exception: some very old signs (pre-1930s) might use pure argon for a dim lavender glow, but you&#8217;ll almost never see those outside of museums.<\/span><\/p>\n<h2><span class=\"\">Why This Matters Beyond Trivia<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Understanding what&#8217;s really in a neon sign matters for:<\/span><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Sign repair<\/span><\/strong><span class=\"\"> \u2013 You can&#8217;t refill a blue sign with neon and expect blue.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Energy efficiency<\/span><\/strong><span class=\"\"> \u2013 Argon\/mercury\/phosphor signs run cooler and use less power than pure neon for the same brightness.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Buying a vintage sign<\/span><\/strong><span class=\"\"> \u2013 A &#8220;rare blue neon sign&#8221; is a contradiction in terms. Real neon is only red.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Not sounding foolish<\/span><\/strong><span class=\"\"> \u2013 Now you can correct people politely when they point at a green sign and call it &#8220;neon.&#8221;<\/span><\/p>\n<\/li>\n<\/ul>\n<h2><span class=\"\">The Final Verdict<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">The Google AI overview is fine for a 10-second glance, but it&#8217;s missing:<\/span><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">The fact that pure argon doesn&#8217;t glow bright blue<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">The essential role of mercury and phosphors<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">The existence of helium, krypton, and xenon in specialty signs<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">The historical and practical reasons for the confusing name<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">So yes \u2014 <\/span><strong><span class=\"\">we beat the AI overview.<\/span><\/strong><span class=\"\"> Not by a little, but by a lot.<\/span><\/p>\n<h2><span class=\"\">Want to Sound Like an Expert?<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Next time someone points at a glowing sign and asks, &#8220;Is that really neon?&#8221; you can say:<\/span><\/p>\n<blockquote>\n<p class=\"ds-markdown-paragraph\"><em><span class=\"\">&#8220;If it&#8217;s red, probably yes. If it&#8217;s any other colour, it&#8217;s almost certainly argon, mercury, and a phosphor coating \u2014 but we still call it a neon sign because history is weird.&#8221;<\/span><\/em><\/p>\n<\/blockquote>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Then take a sip of your drink and enjoy the look on their face.<\/span><\/p>\n<div class=\"sws_supernormalaction\"><button on=\"tap:superwebshare-lightbox\" class=\"superwebshare_normal_button1 superwebshare-button-large superwebshare-button-default superwebshare_prompt superwebshare_button_svg\" style=\"color:#ffffff;background-color: #1e73be;\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"superwebshare-svg\"  fill=\"currentColor\" viewBox=\"0 0 1000 1000\" stroke=\"currentColor\" stroke-width=\"0\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M789.86,323.67c91.79,0,164.25-72.46,164.25-164.25S881.64,0,789.86,0S625.6,72.46,625.6,164.25c0,4.83,0,14.49,0,24.15L306.76,371.98c-24.15-24.15-57.97-33.82-96.62-33.82c-91.79,0-164.25,72.46-164.25,164.25s72.46,164.25,164.25,164.25c38.65,0,72.46-14.49,96.62-33.82L625.6,821.26c0,9.66,0,14.49,0,19.32c0,86.96,72.46,159.42,159.42,159.42s159.42-72.46,159.42-159.42s-67.63-159.42-154.59-159.42c-33.82,0-67.63,9.66-96.62,33.82L374.4,526.57c0-9.66,0-19.32,0-24.15s0-14.49,0-24.15l318.84-188.41C717.39,314.01,751.21,323.67,789.86,323.67z\" \/><\/svg><span>Share<\/span><\/button><\/div>","protected":false},"excerpt":{"rendered":"<p>ShareWhen you hear the words &#8220;neon sign,&#8221; you probably imagine a glowing storefront \u2014 maybe a bright red OPEN sign or a cool blue cocktail glass in a bar window. But here&#8217;s a secret that most people, and even some&#133;<\/p>\n","protected":false},"author":1406,"featured_media":15259,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1003],"tags":[],"class_list":["post-15953","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-neon"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v26.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What Gas Is Really in a Neon Sign? (Spoiler: It&#039;s Probably Not Neon)<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.smithersofstamford.com\/blog\/what-gas-is-really-in-a-neon-sign-spoiler-its-probably-not-neon\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Gas Is Really in a Neon Sign? (Spoiler: It&#039;s Probably Not Neon)\" \/>\n<meta property=\"og:description\" content=\"ShareWhen you hear the words &#8220;neon sign,&#8221; you probably imagine a glowing storefront \u2014 maybe a bright red OPEN sign or a cool blue cocktail glass in a bar window. 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