Can you take powder on a plane and what are the restrictions or guidelines for doing so"?

Yes, you can take powder on a plane, but there are restrictions. The TSA limits the amount of powder you can bring in your carry-on to 12 ounces (350 milliliters) per container. Larger amounts must be packed in checked luggage. Powder substances like flour, sugar, and spices are generally allowed, but powders over 12 ounces may be subject to additional screening. It's best to check the TSA website for the most up-to-date guidelines.