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Leave an iron too long on a garment and you can burn it from the heat, leaving behind brown or black scorch marks that render a shirt almost unwearable. Almost, because scorch marks from an iron can come off that shirt, provided they're light enough that they never singed the fabric. If you're on the fence about whether to treat a shirt, look for melted or burned fibers that tell you treatment's a no-go. If you don't see those, go ahead and save that shirt.