Handmade pottery sits on your shelf, in your kitchen, and sometimes touches your food—so it's worth knowing what safety standards and practices the maker has followed. Many ceramic studios operate in home workshops or small commercial spaces with varying levels of oversight, making it your responsibility to ask the right questions before you buy or commission a piece.
Why Safety Matters in Handmade Ceramics
Unlike mass-produced dinnerware, handmade pottery isn't automatically tested or certified by third parties. Food-safe glazes, clay composition, firing temperatures, and studio practices all affect whether a bowl is actually safe to eat from or just beautiful to look at. Potters range from hobbyists experimenting in their garage to professionally trained artisans with formal training in materials science—and that gap matters.
Questions to Ask About Glazes and Food Safety
Ask directly: "Is this food-safe?" and "Can it hold liquids safely?"
These aren't the same thing. A glaze might be food-safe for display but not for daily use with acidic foods or beverages. A functional piece requires glazes free of toxic lead, cadmium, and other heavy metals. Most professional potters use commercially manufactured glazes formulated and tested to be food-safe, but some experiment with raw materials or recycled glazes—which can be risky.
Request specifics: the glaze name, manufacturer, or the potter's testing results. Reputable makers can tell you exactly which glaze they used and whether it's been tested. If they're vague or defensive, that's a red flag.
For pieces that hold hot liquids, ask about the clay body's thermal shock resistance. A cup fired to cone 10 stoneware is more durable than low-fired earthenware, which can crack or leak when exposed to temperature changes.
Studio Practices and Clay Body Safety
Ask where the clay comes from and if it's been tested for contaminants.
Commercial clay bodies from established suppliers (like Laguna, Standard, or Imco) are manufactured and quality-controlled. Some potters dig or recycle their own clay, which may contain mica, iron, or other particles that affect durability and safety. Neither approach is inherently wrong, but transparency is crucial.
For pieces that contact skin regularly (like face masks or wearable ceramics), ask about studio cleanliness and whether clay is tested for mold, bacteria, or allergens—especially important if you have sensitive skin.
Firing Temperature and Durability
Firing temperature directly affects a piece's safety and longevity:
- Earthenware (cone 04–06): Low-fired, porous, can absorb bacteria and liquids over time. Best for decorative use only.
- Stoneware (cone 6–10): Mid to high-fired, more durable and food-safe if glazed properly. Standard for functional ware.
- Porcelain (cone 10+): High-fired, non-porous, durable, and excellent for daily use.
Ask the potter what cone their kiln fires to and why they chose that temperature for your piece. Different firings affect longevity, strength, and how the glaze bonds to the clay.
Custom or Commissioned Work
If you're ordering a custom piece, clarify expectations upfront:
- Will it be food-safe?
- What's the lead time? (Typical handmade work is 4–12 weeks, depending on complexity and kiln schedules.)
- What happens if it cracks or breaks during firing? (Good potters rebuild or refund.)
- Are there any health concerns specific to the piece—like skin contact for jewelry, or heat resistance for cookware?
When comparing potters on a platform like Mercoly, you can see reviews, ask these questions directly, and compare how different makers approach safety and materials.
Testing and Certification
Home potters don't typically have access to professional lead-testing kits, but some send samples to commercial labs (cost: $30–$80 per sample). Ask if a potter has done this; it shows commitment to safety. Professionally produced dinnerware often includes test certificates.
For high-value or functional pieces, it's reasonable to ask for documentation or a safety guarantee in writing.
Frequently Asked Questions
Q: Can I use handmade pottery in a microwave or dishwasher? Not always—ask the potter first. Some glazes or clay bodies can't handle repeated temperature changes or harsh detergents. Many handmade pieces are hand-wash, air-dry only.
Q: What's the difference between "food-safe" and "food-grade"? Food-safe means it won't leach harmful chemicals; food-grade typically refers to commercial certification. Handmade pottery is almost never officially "food-grade," but can still be genuinely food-safe if made with proper materials and firing.
Q: How do I know if a glaze contains lead? Ask the potter for the glaze name and manufacturer's safety data sheet (SDS), or ask directly if it's been tested. Reputable makers keep this information available.
Start asking these questions now, and you'll know exactly what you're bringing into your home.