Sharpie markers are often used for a variety of labeling tasks, including food containers. They are known for their permanent ink, which can adhere well to various surfaces, including plastic, glass, and metal. This makes them suitable for labeling food containers, as the ink typically resists smudging and fading. However, it is important to note that while Sharpies are generally considered safe for marking containers, the ink is not designed to be food-grade. Therefore, it is advisable to avoid direct contact with food or to use lids and surfaces that do not touch the food itself. If someone is concerned about ink safety, they may wish to look into using permanent markers specifically labeled as non-toxic and suitable for food storage. For the best practices and product information, it may be helpful to consult the current Sharpie website, which often provides guidance on product usage and safety.