How to differentiate between gold and copper
Distinguishing between gold and copper can be challenging, as both are precious metals that share some similarities. However, there are various methods to differentiate between them. In this article, we will explore some common ways to distinguish between gold and copper:
1. Color:
- Gold typically has a bright, shiny, and yellow color that can range from pale yellow to deep yellow.
- Copper, on the other hand, is red or orange in color, leaning towards red. The prominent feature of copper is its vivid red hue.
2. Hardness:
- Gold is usually soft and can be easily bent. You can use a sharp tool to leave a mark on the surface of gold with ease.
- Copper is harder and more rigid than gold, making it difficult to bend.
3. Scratching Test:
- The scratching test can be employed to differentiate between gold and copper. Pass a sharp tool gently across the surface of the metal you want to test. If the scratch appears golden in color, it indicates the presence of gold. A red or orange scratch signifies the presence of copper.
4. Sound Test:
- When you gently tap the metal piece using a metallic tool, you will hear a bell-like sound if it's made of gold. Copper will produce a more prolonged, less resonant sound.
5. Specific Gravity:
- Gold is significantly heavier than copper. You can use a balance to measure the weight of the metal piece and determine whether it contains gold or copper.
6. Chemical Behavior Test:
- Chemical substances like nitric acid can be used to test the reactivity of gold and copper. Gold is typically non-reactive with most acids, while copper can react and release nitrogen oxide gas.
It's important to note that these methods can help you distinguish between gold and copper, but they may require skill and experience to accurately identify the metal. If you believe you have a valuable piece of gold or copper, it is advisable to consult an expert in the field to ensure an accurate evaluation.
