Are colored glass cups poisonous?

Colored glass cups are quite common in our daily life. Colored glass cups are pleasing to the eye and have certain ornamental value. However, you should also be careful when drinking water from colored glass cups. Because the production process of colored glass cups is different, there may be some toxins in them. For example, some of them are added with chemicals. Such glass cups will have certain adverse effects on health, so you must learn how to identify them.

It is recommended that you choose colored glass cups carefully. Because: 1. Glass itself has no color; 2. There are two possibilities for the production of colored glass: A. Natural color, the original material used to make the glass contains some minerals, which makes the glass colorful; B. Most colored glass is made by adding pigments during the processing and production process, and these pigments generally contain heavy metals. But the color cannot be used as the reason for the problem of the glass.

How to identify lead-free glass?

1. Look at the label: lead-free glass generally contains potassium, and most of them are high-end handicrafts with labels on the outer packaging; while leaded glass contains lead, that is, the crystal glassware commonly seen in some supermarkets and street stalls, the lead oxide content can reach 24%. 2. Look at the color: Lead-free glass has better refractive index than traditional lead-containing crystal glass, and more perfectly displays the refractive index of metallic glass; for example, some ornaments of various shapes, crystal wine glasses, crystal lamps, etc. are made of lead-containing glass. 3. Look at the heat resistance: Glass cups can generally withstand very high temperatures, but generally have poor resistance to extreme cold and heat. Lead-free crystal glass has a high expansion coefficient and is less resistant to extreme heat and cold. If you use boiling water to make tea in a particularly cold lead-free glass, it is prone to bursting. 4. Weigh the weight: Leaded crystal glass products are slightly heavier than lead-free crystal glass products. 5. Listen to the sound: The sound of lead-free glass is more pleasant than the metallic sound of lead-containing crystal glass, and it is known as the "musical" cup. 6. Look at toughness: lead-free glass is more resilient and impact-resistant than lead-containing crystal glass.