The mirror is rinsed and then soaped. For washing the mirror we use sea sponges that have been treated to remove any particles that may be embedded in the sponges. Sponges are dipped into buckets of soapy water and then squeezed out over the mirror as shown in the photo below.
After additional rinsing and an evaluation of the surface reflectivity (improved almost 10% at this point), it is time to remove the old layer of aluminum from the mirror. It is treated with a solution (a mix of Copper Sulfate & Hydrochloric Acid) we call "Green River" that dissolves the aluminum from the disc, taking it from this . . . .
The mirror is then dried with an industrial paper towel that leaves no particles behind.
To give the mirror its new coating of aluminum it must be carefully lifted . . . .
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