Are Handmade Ceramic Mugs Safe for Coffee?

A handmade ceramic mug is suitable for coffee when the maker uses a clay body and glaze intended for functional ware and fires them to the correct maturity. Most contemporary studio potters clearly identify whether a piece is made for food and drink.

What makes pottery food safe

• A mature clay body: stoneware should be fired to the temperature range for which the clay is formulated.
• A suitable glaze: food-contact surfaces should use glazes intended and tested for functional ware.
• A well-fitted surface: the glaze and clay body should work together without defects that compromise use.
• No metallic decoration in the microwave: lusters and metallic accents can spark and should never be microwaved.

What to be cautious about

Use extra care with decorative or vintage pottery of unknown origin, and with pieces made through processes such as raku or pit firing. Unless the maker specifically identifies them as functional ware, treat them as decorative rather than using them for food or drink.

If a maker describes a piece as decorative only, believe them.

Microwave and dishwasher

Our stoneware mugs contain no metallic decoration and are suitable for microwave use. Ceramic can become hot along with the drink, so handle it carefully.

Dishwashers are fine for glazed surfaces. Where hand washing helps is with matte and burnished finishes, which stay richer without repeated hot detergent cycles.

Just ask

Any potter who fires functional ware can tell you their clay body, their cone, and whether their glazes are tested for food use. If you can't get an answer, that itself is the answer.