Gender reveal powder is a substance that is used to reveal the gender of an unborn baby. The powder, which was originally designed for culinary purposes, can be dyed pink or blue and mixed into cake batter, icing or even beverages.
Gender reveal powders are usually made from cornstarch, sugar and colorings like food coloring. It is also possible to make it at home with just a few ingredients like cornstarch and Kool-Aid mix. They are not toxic because they have no known harmful side effects in adults but they have been known to cause allergic reactions in children. There should be no harm done if the powder gets into your mouth; you would just taste it as you might with any other food item that has been put on your tongue by mistake.