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While I'm not using a $22,000 microscope and equally expensive camera,
The samples look pretty much the same to an untrained eye.
The brass guy used my quickie samples saying there wasn't enough of a difference to worry about, results were good enough to tell exactly what was going on.
That's why I picked up the way he did quickie samples, because it works.
As for burnishing, that would be the reason for silicone carbide cutting material and a constant flow of water, nice wet sanding really brings up the grain with a good clean cut.
If you don't fuzz up the sample, you don't have to try & fix it.
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