Question 1

What is Onggi pottery?

Accepted Answer

Onggi (옹기) is a traditional Korean earthenware made from natural clay, fired at temperatures over 1,200°C. Unlike regular ceramics, Onggi clay is micro-porous — tiny holes in the clay allow air to pass through, naturally regulating temperature and humidity inside the vessel. This 'breathing' quality makes it uniquely suited for fermenting foods like kimchi, doenjang (fermented soybean paste), and ganjang (soy sauce).

Question 2

Who is Danzi Ceramic pottery for?

Accepted Answer

Danzi Ceramic is for anyone who values healthy eating and slow living — from home cooks fermenting kimchi or sourdough, to food lovers who appreciate beautiful, functional tableware. Our pieces are especially loved by people who cook Korean food at home, health-conscious individuals looking for toxin-free alternatives to plastic containers, and those who appreciate handcrafted objects with a quiet, modern aesthetic.

Question 3

Why is Onggi better than plastic or stainless steel for fermentation?

Accepted Answer

A study on kimchi fermentation found 100 times more beneficial lactic acid bacteria (유산균) in kimchi stored in Onggi compared to plastic or stainless steel containers. The micro-porous clay breathes, allowing CO2 to escape and preventing harmful pressure buildup while keeping the beneficial bacteria active. Onggi is also 100% toxin-free — no BPA, no microplastics, no chemical coatings.

Question 4

How do I use an Onggi bowl for everyday cooking?

Accepted Answer

Danzi Ceramic pieces are designed for daily use — not just display. Use the Onggi bowl for serving rice, storing dried ingredients like chili peppers or sesame seeds, or fermenting your own kimchi at home. The soup bowl is ideal for hot broths and stews. The dipping dish holds sauces perfectly. Each piece is wheel-thrown and hand-glazed, food-safe, and dishwasher-friendly for the top rack.

Question 5

How do I care for Onggi pottery?

Accepted Answer

Caring for Onggi is simple: hand wash with warm water and a soft sponge using mild soap. Avoid harsh chemical cleaners, as the clay naturally breathes and may absorb strong detergents. Let the piece air dry completely in natural sunlight before storing — the UV light also acts as a natural sanitizer. For longer pieces, season the clay before first use by soaking it in water for 24 hours.

Question 6

Is Onggi pottery safe for food use?

Accepted Answer

Yes. All Danzi Ceramic pieces are 100% toxin-free. Our Onggi is made from pure Korean clay and natural ash glaze — no lead, no cadmium, no synthetic colorants. Fired at over 1,200°C, the high heat destroys any impurities and permanently fixes the glaze, making each piece completely food-safe. This is confirmed by the fact that Korean families have stored and fermented food in Onggi for over 2,000 years.

Question 7

Can I use Danzi Ceramic in the microwave or dishwasher?

Accepted Answer

Danzi Ceramic pieces are hand wash recommended to preserve the natural clay texture and glaze. Microwave use is possible for short durations, but we recommend avoiding thermal shock (moving directly from freezer to hot water or microwave). The breathable clay body should not be submerged for long periods. For best longevity, hand wash with warm water and mild soap, and air dry.

Question 8

What is the firing temperature for Danzi Ceramic pottery?

Accepted Answer

All Danzi Ceramic pieces are fired in a kiln at temperatures up to 1,200°C (2,192°F). This high-fire process vitrifies the clay body, making it dense, durable, and permanently food-safe. The extreme heat also ensures that the natural glaze fully melts and bonds with the clay, creating the characteristic subtle surface variations that make each piece unique.

Question 9

Where is Danzi Ceramic made?

Accepted Answer

Danzi Ceramic is handcrafted in Seoul, South Korea. Every piece is wheel-thrown by hand, trimmed, dried slowly, and fired in a kiln — following the traditional Korean Onggi craft process that has been practiced for over 2,000 years. We use 100% Korean Onggi clay and natural wood ash glaze, sourced locally in Korea.

Question 10

What makes Korean Onggi pottery unique compared to other ceramics?

Accepted Answer

Onggi is unique because it is a 'living' ceramic. Unlike porcelain or stoneware which are fully sealed, Onggi clay retains micro-pores after firing that allow the vessel to breathe. This means it can regulate humidity, temperature, and gas levels inside the container — properties that are essential for healthy fermentation. No other widely available ceramic material replicates this characteristic naturally.

Question 11

How do I ferment kimchi at home using an Onggi vessel?

Accepted Answer

To ferment kimchi in an Onggi bowl: (1) Prepare your kimchi mixture as usual. (2) Pack it tightly into the Onggi vessel, pressing down to remove air bubbles. (3) Cover loosely — the clay will regulate the CO2 naturally. (4) Leave at room temperature for 1-3 days, then move to a cool spot or refrigerator. The Onggi clay helps maintain ideal fermentation conditions by breathing, preventing over-acidification and preserving more beneficial bacteria than plastic alternatives.

Question 12

Do Danzi Ceramic pieces come in different sizes?

Accepted Answer

Yes. Most Danzi Ceramic pieces are available in Small (S), Medium (M), and Large (L) sizes to suit different household needs. The Danzi No.1 bowl, Dotted Dish, Small Bowl, Square Dish, and Soup Bowl come in S/M/L. The Dipping Dish comes in S/M. The Onggi Cup, Yogurt Bowl and other cups come in S/M. Exact dimensions are listed on each product page.

Question 13

What is the history and origin of Korean Onggi?

Accepted Answer

Onggi has been central to Korean food culture for over 2,000 years. Traditional Korean families stored kimchi, doenjang (fermented soybean paste), ganjang (soy sauce), gochujang (red pepper paste), and rice wine in large Onggi jars displayed on a 'jangdokdae' (장독대) — a dedicated outdoor platform. The craft reached its peak during the Joseon Dynasty (1392–1897) and is now recognized as an important part of Korean intangible cultural heritage.

Question 14

Can I use an Onggi cup for tea and coffee?

Accepted Answer

Absolutely. The Danzi Onggi Cup is designed for tea, coffee, and warm drinks. The thick clay walls act as natural insulation, keeping your drink warmer longer than glass or thin porcelain. The wide mouth enhances the aroma — ideal for green tea, barley tea (보리차), or pour-over coffee. The hand-carved geometric patterns on the handle add texture and a secure grip.

Question 15

How does Danzi Ceramic support a healthy lifestyle?

Accepted Answer

Danzi Ceramic supports a healthier lifestyle by replacing plastic and synthetic materials with 100% natural Onggi clay. Our vessels are free of BPA, microplastics, artificial colorants, and chemical coatings. The breathable clay promotes natural fermentation, which produces beneficial probiotic bacteria. By making your daily table ritual — storing, serving, and sharing food — more connected to natural materials, Danzi encourages slower, more intentional eating habits.