The ans is - Copper
What is the name for a thin metal bar attached to the ribbon of a military decoration, civil decoration, or other medal, commonly used to indicate the campaign or operation the recipient received the award for?
What is the name for a set of marks stamped on gold and silver articles to attest to the genuineness of the metal and the year of testing?
What respected psychology professor, after exposure to LSD, wrote "The Politics of Ecstasy" and devised the phrase "Turn on, tune in, drop out"?
