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Tire beads edit
A rastrum is used with special crayons in the tire industry to identify specific tire beads using a 4-5 character color code. For example, ROYGB would correspond to a bead marked with rastrum crayons Red Orange Yellow Green Blue. — Preceding unsigned comment added by 2605:a000:1209:c4ef:44cb:4daf:3e4e:9f23 (talk) 03:05, March 7, 2019 (UTC)