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(5) Check with a polarizing mirror: rotate 360 degrees under the polarizing mirror, and the natural crystal with bright and dark changes is the false crystal.

The float glass production process begins with the melting of raw materials, including silica sand, soda ash, and limestone, at high temperatures. This molten mixture is then floated on top of molten tin, allowing the glass to spread evenly and form a continuous sheet. As the glass moves through the annealing lehr—a controlled cooling chamber—it gradually solidifies and is cut into standardized sheet sizes.