First, the acidic medicine milling type, the white matte in the middle is washed out by the medicine, the method is not complicated, the cost is low, but the anti-corrosion layer of the lens is destroyed, and the service life is not long;
Second, the machine sandblasting treatment can achieve the effect by destroying the mercury surface on the back through the sandblasting machine, but the service life is also not long, but it is much less corroded than the potion;
Third, the most advanced large-scale laser burning, with very high accuracy, and will not damage the anti-corrosion layer, so that the lens can be used for a long time.
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