Quick tip for aligning mirrors with masking tape or similar

Most people use masking tape or something like that to align mirrors. This carries the risk of fumes from marking the tape condensing on the mirror. Sticking square of aluminum foil to the back of the masking tape where the beam will hit prevents this. The foil is impervious to the beam, so the tape/foil combo does not burn through to deposit stuff on the mirror.
Not my idea, just passing it along.

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