Antique black has long been the most common and preferred choice by manufacturers of various decorative metal components. Tableware, architectural hardware, handicrafts, etc. in the international market love to adopt this antique tone. The process is safe, odorless, with outstanding antique performance, fast blackening speed and obvious color change, which can meet customers' various needs for color, and the blackened film layer can also contain no nickel, less energy consumption, and no environmental pollution , and is suitable for a variety of substrates.