Looks like I have a problem. I have tried spritzing and literally soaking a section and the blue lines are not going away. I took a washcloth and put mild soap on it and gently rubbed and the blue is still there. I'm beginning to wonder if this is a really old pre-printed set of squares or whether she cut them out and ironed them. I know when I was young the blue did not wash out when I did embroidery. Any other ideas? Has anyone ever tried peroxide? I remember my mom used it if she scorched something, but that is a different problem. Thank you. Gerry