Does Zellige Tile Contain Lead? What Buyers Should Know

It depends on the maker. Traditional zellige was glazed with lead, because lead oxide melts the glaze evenly and gives the deep, pooled color the style is known for. Many zellige tiles sold today are still made that way. But lead is not required: modern glaze chemistry can produce rich color without it, and some workshops, including the one that makes Handtile's tiles in Fes, Morocco, use lead-free glazes. The only reliable way to know is to ask the seller about the specific tile you are buying.

In this article

• Why was early zellige glazed with lead?
• Do zellige tiles still contain lead today?
• Is lead in a tile glaze actually dangerous?
• How did glazes and colors evolve without lead?
• What should you ask before buying zellige?
• Where does Handtile stand?
• FAQ

Why was early zellige glazed with lead?

Zellige has been made in Fes for about 1,200 years, and for most of that time potters used what worked. Lead oxide was the standard flux in glazes across the Mediterranean and the Islamic world. It lowers the melting temperature of the glass, so the glaze fuses at a kiln temperature the clay can survive, and it produces a smooth, glossy surface.

Lab analysis backs this up. A 2020 study of glazed tiles from the Saadian Tombs and El Badi Palace in Marrakech used X-ray fluorescence and found lead-silica glazes throughout, with lead oxide as the main flux (El Halim et al., Journal of Archaeological Science: Reports). Lead also helps colorants like copper (green) and manganese (black) dissolve evenly, which is part of why old zellige looks so alive.

Do zellige tiles still contain lead today?

Often, yes. The same study found that tiles made for recent restorations in Morocco were also lead-based, with glossier and brighter glazes than the originals. Independent testing reported by Business of Home in late 2026 found high lead content in zellige from several US sellers. The same article notes that the US has no specific regulations for lead content in wall and floor tile.

That does not mean all zellige contains lead. Lead levels vary by workshop, by batch, and even by color. A pale white and a deep green from the same maker can have very different glazes. This is why a general statement like "zellige is safe" or "zellige is toxic" is never accurate.

Is lead in a tile glaze actually dangerous?

Lead has no known safe level of exposure, so avoiding it where you can is reasonable. But the risk from a finished tile depends on how the lead can reach you. Experts quoted in the Business of Home piece point to a few routes:

• Dust from cutting, drilling, and demolition. This is the biggest concern for installers and for anyone drilling into a finished wall later, for example for a towel bar.
• Food contact. Lead glazes are most dangerous on surfaces that touch food or drink, which is why countertops and kitchen prep areas call for extra caution.
• Wear and harsh cleaning. Scrubbing, abrasives, and acidic cleaners can wear a glaze over time, which matters more if the lead can leach out.

A lead glaze that is fully fired, intact, and cleaned gently is generally considered low risk on a wall. Total lead (what a handheld XRF gun measures) and leachable lead (what can come out of the glaze) are different numbers, so ask which one a test reports. For gentle cleaning habits that protect any glaze, see how to clean zellige tiles without damaging the glaze.

How did glazes and colors evolve without lead?

Today's glaze makers have far more raw materials and knowledge than a potter had 1,000 years ago. Instead of relying on lead oxide to melt the glass, a workshop can use other fluxes such as boron, sodium, potassium, and calcium compounds, often prepared as a pre-fused glass called a frit. Modern colorants and opacifiers are also better understood, so cobalt blues, copper greens, and creamy whites can be reached without lead.

There are trade-offs. Lead-free glazes can be harder to fire without cracking or crazing, and some makers find the palette narrower or the finish a little more uniform. A workshop that gets it right keeps the pooling, softness, and depth of color that make zellige look handmade. If you want to compare real handmade zellige to tile that only imitates the look, read real zellige vs zellige-look tile.

What should you ask before buying zellige?

Whatever brand you choose, these questions get you a clear answer:

• Is the glaze on this specific color lead-free, or does it contain lead?
• Is there a Safety Data Sheet, lab report, or written statement from the workshop?
• Does the test report total lead or leachable lead, and which method was used?
• Where and by whom was it made?
• Is it recommended for the surface you plan to use, such as a shower wall, floor, or kitchen counter?

A seller who answers these directly is a good sign. A vague answer, or "all zellige is safe," is not. Our complete guide to zellige explains how it is made and what to expect, and the guide to buying zellige in the US covers how to compare sellers.

Where does Handtile stand?

Handtile's zellige is handmade in Fes, Morocco, using the traditional method: hand-cut clay, hand-applied glaze, and a kiln firing. The workshop that makes our tiles states that its glazes are lead-free, and we choose to work with glazes formulated for today's colors instead of the leaded recipes of the past. If you have questions about a specific color, write to us before you order.

The simplest way to judge a tile is to hold it. We send free samples (you only cover shipping), so you can check the color, thickness, and glaze in your own light before committing.

Frequently asked questions

Is zellige tile safe for a shower or bathroom?

A fully fired, intact glaze on a wall is generally considered low risk, and lead-free glazes remove the question. Take extra care with dust during cutting and drilling whatever the tile. See using zellige in a shower.

Can you test zellige tile for lead at home?

Home swab kits can give a rough indication, but they are not reliable for glazed ceramics. A lab test, or a Safety Data Sheet from the maker, is far more dependable, and it should state whether it measures total or leachable lead.

Is lead-free zellige less authentic?

No. Authenticity comes from the handmade process: hand-cut clay, hand-applied glaze, and kiln firing in Morocco. The flux in the glaze changes the chemistry, not the craft.

Does sealing zellige make lead safer?

Sealers do not remove lead from a glaze and should not be treated as a safety fix. Sealing mostly protects grout and unglazed edges, as covered in do zellige tiles need to be sealed.

How much does zellige cost?

Handtile's 4x4 squares are $19.62 per sq ft (a 5 sq ft box is $98.10). Installation is typically about $4 per sq ft, so plan on roughly $24 per sq ft all in. More detail is in the zellige tile cost guide.