Phase contrast images of a mirror 150 mm aluminum 6351 T6 after repolishing be done to remove the oxidized layer.The procedure is fast and simple and does not affect the optical figure of the mirror.To make the re-polishing, use the tool with a coat of satin fabric 100% polyester. The fabric is soaked with solvent, which can be kerosene, Turpentine, white spirit or similar.The procedure is not abrasive and has for objective just merely the layer removal oxidizes. We must remember that this layer is very thin, between 2-10 nanometers.Soon after cleaning in a few minutes is naturally created a new protective layer of the order of 1 to 2 nanometers. This natural transparent layer is also known as Corundum.

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