How to tell if something is made out of copper or brass (or another type of metal) by looking at it without touching it or using any other method to test it

3 Ways to Identify a Metal - wikiHow

Jewelry Metals 101: Gold, Silver, and Platinum - Gem Society

How to Determine if a Copper Décor Item Is Real Copper

How to Clean Brass and Remove Tacky Tarnish, Architectural Digest

Brass Metal: Types of Brass Metal, Types of Brass Metal, Applications and Advantages

Guide on How to Choose the Right Plumbing Pipe

How to test a metal to determine if it is copper - Quora

Metal Testing Service: How to Identify Your Jewelry

Gold Purity and the Differences Between White and Yellow Gold : Arden Jewelers

Metal Identification Tests