Differences between Brass and Red Copper:

1. Main Composition  
   - Brass: Brass is a copper-zinc alloy, composed of approximately 60% copper and 40% zinc, with possible small amounts of other metals such as lead or tin.  
   - Red Copper: Red copper, also known as pure copper or purple copper, is the elemental form of copper with a purity of over 99%, composed almost entirely of copper.


2. Appearance and Color  
   - Brass: Brass typically has a light golden yellow or yellow-brown color and possesses good luster.  
   - Red Copper: Red copper has a reddish-purple or rose-red color, with a high surface shine that gives it a unique metallic texture.


3. Physical Properties  
   - Density: Brass has a slightly higher density than red copper due to the presence of zinc and other alloying elements.  
   - Hardness: Brass is usually harder than red copper, providing better wear resistance and resistance to deformation during processing.  
   - Conductivity and Thermal Conductivity: Red copper has excellent electrical and thermal conductivity, second only to silver among metals, making it widely used in wires and cables. In contrast, brass has poorer conductivity, but its higher strength makes it suitable for applications requiring durability.


4. Corrosion Resistance  
   - Brass: Brass has strong corrosion resistance and does not easily rust. The zinc in brass can form a dense oxide layer with other metals, protecting the brass substrate from further corrosion.  
   - Red Copper: Red copper is prone to oxidation in humid or corrosive environments, forming patina (green copper carbonate), which makes its corrosion resistance relatively poor.


5. Applications  
   - Brass: Due to its good wear resistance, machinability, and aesthetic appeal, brass is widely used in manufacturing valves, pipes, radiators, musical instruments, and decorative items. Brass can also be alloyed with other metals to adjust its properties for various applications.  
   - Red Copper: Due to its high electrical and thermal conductivity, red copper is extensively used in manufacturing wires, cables, electrical brushes, and electrical discharge machining copper, among other products that require good conductivity. Red copper is also used in the production of musical instruments, artworks, and decorative items.