Copper is a reddish metal that has many valuable uses ranging from electrical engineering purposes to decorative finishes. It is used on an assortment of products ranging from pennies and bullets to electrical connectors and automotive parts.  Copper is used heavily as an underplate due to its ability to adhere extremely well to a variety of different substrates and plate well with other subsequent metals. Copper is the second best conductor of electricity and an excellent conductor of heat. These properties give it a host of engineering applications. Copper is also very ductile and can be buffed to a shine giving the metal a decorative value.

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Acid copper: provides excellent leveling, high macro-throwing power, and high plating speeds. However, acid copper does have limitations. Some metals, such as steel and aluminum, are attacked and etched by the acidic solution. It can also produce immersion deposits that have very poor adhesion. For these metals, a cyanide copper strike must be used prior to plating.   

Cyanide copper: is essential for plating on steel, zinc, and aluminum because it adheres well to them and minimizes immersion deposits. Cyanide copper has excellent throwing power which leads to less thickness variations. This is extremely important when dealing with parts that have complicated shapes.