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Old 03-25-2023, 01:13 AM
Marc Bourget Marc Bourget is offline
Join Date: May 2013
Location: North Ca
Posts: 708

A "carbon black body" is the reference of 100% emmissivity.

If you have an IR thermometer that has an emissivity adjustment, you're in good shape. IIRC, lightly oxidized Alu is about 40%. But one way of checking is to have, say a charcoal briquette lay it next to the Alu, allow time to Temp equalize and shoot both to verify.
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