Argon

Argon, Ar, is another noble gas, meaing it is very non-reactive. Argon is mostly used because of its lack of reactivity, like for TIG welding where an inert atmosphere is needed, filling jars to store reactive materials, or even for incandesent light bulbs where an inert atmosphere is needed to keep the filiment from oxidizing to powder.

Argon can also be used similarly to neon lights, the resulting glow is a pleasent blue color. Often a drop of mercury is added, which adds strong ultraviolet rays, which can be used to activate phosphors on the inside of the glass tube and make virtually any color imaginable.

These are my samples!