The safety of colored glass cups depends on the pigments and materials used in their manufacturing process. Most high-quality colored glass cups are safe because they use non-toxic inorganic pigments, such as metal oxides, which are stable at high temperatures and do not release harmful substances. However, some low-quality or counterfeit colored glass cups may use toxic organic pigments or materials with high lead content, which may migrate into the food when in contact with it, and long-term consumption is harmful to health.

To ensure the safety of colored glass cups, the following measures can be taken:

-Purchase well-known brands and products with quality assurance.

-Check the product label to confirm if food safety materials and pigments have been used.

-Avoid using cracked or damaged glass cups as these damages may become a breeding ground for bacteria.

-Regularly clean the glass cups, use mild detergent, and ensure thorough rinsing.

If you doubt the safety of colored glass cups, you can choose to use transparent glass cups as a substitute, because transparent glass cups usually do not contain color additives, making it easier to ensure their safety. In short, choosing high-quality and reputable products and following the correct usage and cleaning methods can minimize potential risks.