1. Material selection: Because the raw materials for making purple sand cups are collected from organic cementing substances in the land, they need to undergo strict screening and treatment, otherwise harmful heavy metal elements and chemical pollutants may be produced. When buying purple sand cups, you should choose a regular brand that proves the quality is qualified.
2. Firing: Firing the purple sand cup requires a long period of high-temperature flame baking. If it is not properly controlled, it may lead to surface irregularities, cracks, cracks and other defects, thus affecting the use effect and safety.
3. Cleaning: The purple sand cup can't be cleaned with detergent, otherwise there will be a chemical reaction on its surface, which will produce substances harmful to human body. It is recommended to rinse with clean water or hot water, and then dry.
4. Storage: When storing the purple sand cup, it should be placed in a dry and ventilated place to avoid direct sunlight and prevent mildew and deterioration.
To sum up, drinking water from purple sand cups is relatively safe, but only by correctly selecting materials, making and using methods can it play its health care role and protect human health.