... to people, so we also call it magic mug.Q.2: What temperature that mug will be ... by pouring hot water. So before changing , the magic layer should be black/ dark green/ dark blue/ ... food inspection standard. Whether the company passed ISO9001.Q.8: Whether the Color changing mug is poisonous? ... ceramic, plastic cement, glass and stainless steel, etc. Q.12: What is the difference of ceramic and porcelain ...