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Black media isn't really recommended although the adverse difference is slight.
The difference is that black absorbs light in a situation where reflctivity and laser power is everything.
If everything's in tip-top condition including the optical clarity of the compound then black media isn't going to be a problem. The cheapest black media should be avoided and will be troublesome in time if not now.
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[b][color=red]Charlie[/b][/color]
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