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Black oxidation treatment is a common method of chemical surface treatment. The principle is to create an oxide film on the metal surface to isolate the air and achieve rust prevention. When the appearance requirements are not high, blackening treatment can be used. The blackening treatment on the surface of steel parts is also called bluing. Black oxidation treatment is a surface coating method commonly used on military knives because it can eliminate reflections.

WILLCOME Medical gauze dressings are sterile or non-sterile pads or bandages made from woven or non-woven cotton or cotton-blend materials. They are commonly used in wound care and medical procedures for various purposes, such as cleaning, covering, and protecting wounds. Gauze dressings are versatile and come in different sizes and forms to suit various wound types and sizes. It's important to select the appropriate type and size of medicated gauze dressing based on the specific wound type, size, and characteristics. Healthcare providers follow established wound care protocols to ensure proper dressing selection, application, and changes. Gauze dressings should be used in accordance with medical guidelines to support the healing process and minimize the risk of complications.

Electroplating is the process of using the principle of electrolysis to deposit a thin layer of other metals or alloys on certain metal surfaces. According to the composition of the coating, electroplating processes can be divided into eight categories: chromium plating, copper plating, cadmium plating, tin plating, zinc plating, nickel plating, gold plating, and silver plating.