Colored glass cups are not all be coated, there are not coated colored glass cups and coated glass cups, depending on the manufacturing process used. Here are the two main types of coloring methods for glass cups:

1. Colored Glass (Not Coated) – Colored Glass Cup

In this case, the color is integrated into the glass itself during the production process. The glass is made with specific minerals or metal oxides that are added to the molten glass, giving it color. This results in durable, long-lasting color that will not fade or peel over time. Common methods for this include:

• Adding metal oxides like cobalt (blue), chromium (green), or iron (amber).
• The color is uniform throughout the glass, so it won’t chip or scratch off like a coating might.

Benefits of Non-Coated Colored Glass:

• Permanent color: The color won’t peel or wear off.
• Non-toxic: No concerns about harmful coatings or chemicals.
• Scratch-resistant: Since the color is part of the glass, it’s less likely to be affected by normal use.

2. Colored Glass with a Coating (Surface Coating) – Colored Glass Cup

In this method, a layer of colored coating is applied to the exterior of the glass. This could be a paint, enamel, or a plastic-based finish. The coating is generally not as durable as glass that has been colored during the manufacturing process, as it can wear off over time, especially with frequent use or washing.

If you have colored glass cups that are designed to be used regularly, like for drinking, the best way is to choose the colored through the glass itself, making them durable and safe. If the color appears to be painted or coated, it might be more susceptible to damage over time.

JY Flame Glass offers the best quality borosilicate glass cups, China Borosilicate glass cups factory, High quality Borosilicate glass cups brand.