Quick methods for identifying materials:
Observe the appearance and luster:
Metal materials (such as stainless steel, brass): Usually have a metallic luster; stainless steel is cool white, while brass is warm yellow.
Enamel/porcelain materials: The surface is smooth, the colors are vibrant, and it has a glassy texture.
Resin/composite materials: Rich in color, but the luster is more plastic-like, and they may be lighter in weight.
Look for markings and stamps:
Metal materials: Check the back or edges for purity markings such as "S/S," "S/S," "S/S," etc.
Enamel/porcelain: Usually without specific metal markings, but may be marked with words like "Enamel."
Simple physical tests:
Magnetic test: Use a magnet to approach the pin; stainless steel is usually non-magnetic, while enamel with an iron base may have weak magnetism.
Weight and feel: Metal materials are heavier, while resin materials are lighter.
Observe the craftsmanship details:
Metal: Check if the edges are smooth and free of burrs.
Enamel/porcelain: Check if the glaze is even and free of bubbles or cracks.
