What should you do if you swallow marker ink?

If you swallow marker ink, first assess the situation and check the marker's label for toxicity information. Most non-toxic markers contain inks that are generally safe in small amounts, but it's best to avoid swallowing any type of ink. Rinse your mouth with water to help clear any residue, and drink a few sips of water to dilute the ink. If you experience any adverse effects or if you're unsure about the ink's safety, contact a healthcare professional or poison control for advice.