Can ceramic and porcelain dishes be washed in a dishwasher?

"Can this piece of pottery be used in a dishwasher?"
This is one of the most frequently asked questions at our store.

In this article, Studio1156, a tableware specialty store, will provide an easy-to-understand explanation of whether "earthenware" and "porcelain" can be used in a dishwasher, precautions for use, tips for safe use, common misconceptions, and knowledge to make your tableware last longer.

Porcelain is "generally OK," but be careful with overglaze decoration

In conclusion, porcelain is generally dishwasher-safe. However, caution is advised for pieces with overglaze decoration that feels raised to the touch.

Porcelain itself is resistant to high temperatures and washing, so it's not a problem. However, dishwashers use hot water and abrasive detergents, which can accelerate the deterioration of painted designs.

Overglaze decoration naturally changes color gradually over time, but frequent dishwasher use can accelerate this deterioration.

In particular, decorations such as gold painting (kinsai) and silver painting are more susceptible to friction and heat and tend to peel off, as the paint particles are fine and soft compared to other colored glazes (red, green, yellow, etc.).

Therefore, at our store, we indicate:

• Overglaze decoration in red, green, etc. → Dishwasher △ (hand washing recommended)
• Delicate decorations such as gold and silver painting → Dishwasher × (not allowed)

Earthenware is "generally NOT OK"

On the other hand, earthenware is generally not dishwasher-safe.

The reason is that earthenware is absorbent and easily retains water internally. If it's subjected to the high-temperature drying of a dishwasher in that state, the water inside the pottery can expand, causing cracks or damage.

However, there are exceptions for some types of earthenware, such as "semi-porcelain" and "heat-resistant earthenware." In such cases, it's safest to check the manufacturer's or retailer's instructions and confirm individually.

Common Misconceptions: "Expensive means NO," "Cheap means OK"

One common misconception is the idea that "expensive tableware = delicate, so not dishwasher-safe" and "inexpensive tableware = durable, so OK."

However, whether a dish can withstand a dishwasher depends on the material and decoration method, not the price. For example, expensive pieces finished with underglaze decoration like sometsuke, or simple porcelain without decoration, can be used without issue. On the other hand, even affordable items with overglaze or gold decoration require caution.

Summary: Check the labels to enjoy your tableware for a long time

To ensure your favorite tableware lasts a long time, always check for the "dishwasher safe" label before use. Many pieces "can be used, but it's best to avoid it."

By valuing the daily effort of care, you can enjoy your favorite tableware more beautifully and for longer.

▪️ For microwave use, please refer to the following:

Can "Earthenware" and "Porcelain" be used in a microwave oven?