The oldest Graffiti I have seen was on a special shown on the Discovery Channel. They had Rabbi's, and Pastors discussing who Jesus Christ was. One Rabbi mentioned the parchments they have in storage which read "Here is the King of the Jews". Those parchments are considered "Graffiti" because they were temporarily posted by order of Temple leaders along the route Jesus Christ was going to be forced to walk. Unauthorized messages in public view is considered graffiti. The intent of graffiti is to inform.
Metallic and non-metallic
It is a mixture - partially metallic and partially non-metallic
Not at all. The main "reason" to get this piercing other than personal adornment is sexual enhancement, and you won't find someone complaining about the added feel of a metallic stud against their highly personal nerve endings. The pain isn't horrible and the tongue also heals quite quickly.
Non-metallic
The BMW M3 E46 was available in 13 colours. The colours were white, red, black, blue, black metallic, sapphire metallic, silver metallic, steel grey metallic, silver grey metallic, topaz blue metallic, mystic blue metallic, interlagos blue metallic, Oxford green metallic and yellow metallic.
The mineral halite is non-metallic.
Metallic Bond .
Exterior ColorsAmber Bronze Metallic, Bermuda Blue Metallic, Black, Dark Blue Metallic, Gold Mist Metallic, Graystone Metallic, Silver Birch Metallic, Sport Red Metallic and Summit White.
All of them, metals are metallic, specifically contain metallic bonds.
Non metallic, kaolin is a clay mineral.
Corundum's luster is metallic.
it is a metallic mineral