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The Problem:
Dye migration or bleeding occurs with polyester garments when the sublimation dyes in polyester fibers are heated to temperatures in excess of 275 degrees Fahrenheit. When plastisol inks are heated to temperatures higher than 275 F, these dyes are released into the ink causing a discoloration of the plastisol ink. The dyes in the garments actually change from a solid to a gas causing the migration. Higher temperatures cause more severe migration so avoid curing temperatures above 320 F.