Orange sparks....mean high-speed steel. Looking for a good cutting tool for the old Rahn-Larmon lathe, I thought I found a candidate. But a touch to the grinding wheel gave orange sparks which looked like straw brooms (single orange trail with a burst at the end). Looking for another tool found this one, which gave deep red, long spark trails...the sign of high speed (high carbon) steel. Just the ticket!
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