Acid etching

Acid etching is a process used in metalworking, glassmaking, and printmaking to create designs or patterns on a surface by using acid to cut into the unprotected parts of a material. The process is also used in the semiconductor industry for microfabrication.

History

The technique of acid etching originated in the Middle Ages, and was used in the production of armour. It was later adopted by printmakers in the 15th century, and has been used in various forms ever since.

Process

The process of acid etching involves covering a surface with a resist (a substance that will not be affected by the acid), then drawing or tracing a design onto the resist. The acid is then applied to the surface, and it eats away at the exposed areas, creating the desired design or pattern.

In metalworking, the acid used is often ferric chloride, while in glassmaking, hydrofluoric acid is commonly used. The choice of acid depends on the material being etched and the desired effect.

Applications

Acid etching is used in a variety of industries and applications. In the semiconductor industry, it is used to create intricate patterns on silicon wafers. In the art world, it is used in printmaking to create detailed and complex designs. It is also used in the production of decorative glass and metalwork.

Safety

Working with acids can be dangerous, and proper safety precautions must be taken when acid etching. This includes wearing protective clothing and eyewear, and working in a well-ventilated area.

See also

• Etching
• Printmaking
• Metalworking
• Glassmaking
• Semiconductor fabrication