K Mart store located in Bay City, Michigan. I purchased twin sink mats by Martha Stewart. When I rinse anything that contains a tomato base such as spaghetti sauce under water before placing the dish or pot in my dish pan the sink mats which are ecru in color change to pink and are almost impossible to remove the stain. My only solution to remove the stain is to soak the mat in bleach, which I do not like to do. I will never buy or recommend this or any other Martha Stewart product again.