The black spots on the tin plate sheet usually refer to a significant color abnormality that appears on the surface of the tin plate sheet after these processes are completed. These black spots generally appear in the shape of dark or black spots, vary in size, and may be scattered or concentrated.

When handling aerosol tin can, make sure to keep it away from fire sources and high temperature environments to prevent the remaining propellant in the can from expanding due to heat or causing a fire.

In summary, cookie tin cans are not made of 100% tin, but of tinplate. Tinplate combines the anti-corrosion properties of tin and the mechanical strength of iron by coating a layer of tin on the surface of the iron plate, making it an ideal cookie tin can material.

Tinplate is a thin steel plate with tin on the surface. Its main component is low-carbon steel, and the surface is covered with a thin layer of tin. Steel is an iron-carbon alloy, mainly composed of iron and carbon, and usually contains other elements such as manganese, silicon, phosphorus, sulfur, etc.

Aerosol tin can is also widely used in the treatment of skin diseases, especially when topical drugs are required. Drugs in the form of aerosols can evenly cover the affected area, promote drug absorption, and improve the treatment effect.