When watching some gameplay videos, I noticed that a green/purple glow will occasionally pass over the player's weapon.
What is this? I don't remember any special weapons with a glow effect, just unusual weapons from Gun Mettle. It doesn't happen on my weapons, so is it a special item?
Best Answer
The glow effect is known as a sheen, and is visible on weapons which have had a Specialized Killstreak Kit applied to them.
From the wiki (Two Cities link also added for context/further reading):
Professional kits also include the sheen (and the kill counter from any kind of kit) along with a special effect placed on the character model's eyes.