Hill's Space

Polished out?

 |  1 min  |  59 words
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Mirror by eye. Looks reflective! It has a sharpie line drawn on it.
The mirror under a microscope. The sharpie line looks purple. Notice the texture next to the sharpie - tons of tiny dots, divots left from 5 micron grinding that I'll need to grind through to get a smooth polished surface.

My mirror is now reflective enough to see the entire surface and get my first Ronchi test image! But I’m not done with polishing - it may look reflective by eye, but the same region under a microscope reveals tiny pits left over from 5 micron grit are still there. I’m not polished out until all those are gone.

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