Color Changing Mug - Grandma Story - Large 16 Ounce - Porcelain Quote: Grandmas are angels in disguise Story: An angel in disguise, retro Grandma bakes treats with her secret ingredient, love! Every mug tells a story. Each mug starts as a solid color with a powerful quote and artwork. As soon as you add a hot liquid, the story unfolds and the artwork transitions. The story mugs are made of high-quality porcelain, have a 16 oz capacity, and feature a unique square shape. BPA Free Manufactured in compliance with California Proposition 65 and US FDA 7117.06-.07