Titanium Nitride (TiN) serves as an excellent universal choice for increasing tool life. TiN increases hardness and has a high oxidation temperature. This coating is bright gold in color with a surface hardness reaching 81 Rc. Titanium Nitride (TiN) is the most common PVD hard coating in use today. TiN has an excellent combination of performance properties, attractive appearance, and safety (meets FDA requirements for surgical tools and implants as well as food contact applications).