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What Gases Are Used in Neon Signs?

Nick Vasco | 3 minutes | January 30, 2025

Neon signs use several different noble gases beyond neon, including:

  • Argon
  • Krypton
  • Xenon
  • Helium

Each gas produces distinct colors and effects, so you should familiarize yourself with different options to choose the right one – and that’s exactly what we’ll help you do in this guide.

Besides covering popular gases in more detail, we’ll show you the different effects they create and their main applications to cover all you need to know before making your choice.

The Classic Neon Gas: Creating the Iconic Red Glow

Despite the growing number of options, pure neon gas remains the go-to choice for creating that classic bright red-orange glow you see in so many storefront windows. When an electric current passes through neon gas contained in glass tubes, it excites the gas molecules, causing them to emit that characteristic warm glow.

What makes neon particularly special is its efficiency – you only need a small amount to produce a bright, eye-catching display. This makes it both cost-effective and reliable for businesses looking to create memorable signage.

Argon and Mercury: The Blue Light Special

While neon creates red light, argon is the secret behind those cool blue hues – but it rarely works alone. When combined with a tiny amount of mercury vapor, it produces a vibrant blue light that’s become a staple in commercial signage.

The best part about argon is its versatility. When you add different phosphor coatings to the inside of the glass tubes, this combination can produce various colors, from bright green to soft pink. This flexibility has made argon-based signs incredibly popular for businesses wanting to stand out.

Beyond the Basics: Specialty Gases for Unique Effects

Neon sign gases extend far beyond neon and argon. Several specialty gases create distinctive effects that might be perfect for your signage needs:

  • Krypton: produces a whitish-yellow glow and is particularly useful in creating subtle effects. It’s even used in airport runway lighting due to its reliability and distinct appearance.
  • Xenon:  creates a beautiful purple light and is often chosen for high-end displays where unique color combinations are desired. Its distinctive glow makes it perfect for businesses wanting to create a premium appearance.
  • Helium: offers a pinkish-red glow and has a special advantage in cold climates – it heats up faster than other gases, making it ideal for outdoor signs in chilly locations.

The Art of Color Mixing in Modern Signage

Sign makers often combine different gases and techniques to create specific colors and effects. Still, it’s not just about the gas choice – several factors contribute to the end result, most notably:

  • Glass color
  • Phosphor coatings
  • The pressure inside the tubes

For example, by combining mercury vapor with different noble gases and phosphor coatings, sign makers can create virtually any color on the spectrum. This versatility allows businesses to match their brand colors exactly or create multi-colored displays that capture attention.

Find the Right Gas for Every Color

Despite their name, the actual gas used for neon lights depends entirely on the color and effect you want to achieve. The right choice of gas can make the difference between a good sign and a great one that grabs attention and lets your business shine.

Whether you’re replacing gas in an existing sign or planning a new installation, understanding different gas options helps you make informed decisions about your signage investment. Choose the supplier that can help you navigate these choices and ensure the exact look you’re aiming for.