Metallic Glazes

The glazes that come out looking like metal rather than glass, the ones that only pretend to, and why we keep both off the inside of a mug.

True metallics
9
Faux metallics
14
Coats to start
3
Metallic Glazes at The Clay Hole

A metallic glaze is trying to do something ordinary glazes never attempt: come out of the kiln looking like metal rather than glass. It gets there by loading the recipe with enough iron, manganese or copper that the surface saturates and the excess crystallises out on top as a hard, reflective skin.

That is also why they are the most demanding glazes we stock. A glaze carrying that much colorant has very little margin. Go thin and it fires as a dull brown wash with no shine at all. Go thick and it runs, blisters, or turns matte and dry. The window between those two is narrower than anything else on our shelves.

The other thing to know before you commit a pot: most metallics are not food surfaces. A glaze saturated with metal oxides is not the same as a stable liner glaze, and a crystallised metallic skin is not one to eat off. Read each glaze page, and when in doubt use a metallic outside and a proven liner inside.

Nine of them here, and every one is worth a test tile before it is worth a pot.

Because that skin is metal rather than glass, we do not put a true metallic on any surface that touches food, whatever the jar says. That is our rule rather than the maker's, and it is the one place we are stricter than the label.

Further down there is a second shelf. Those glazes only look like metal. They are not held to the same rule, and several of them are rated perfectly safe for a mug.

Where to start

23 is a lot to look at. If you want three, these are the three.

1

Palladium

Amaco Potter's Choice

The most convincing mirror we own, and the clearest demonstration of what a metallic is for. It also punishes an uneven coat harder than anything else here, so start on a tile.

2

Gold

Spectrum Various Families

Warm rather than cold, which makes it the easiest metallic to combine with a normal glaze without the pot looking like two ideas.

3

Blackened Copper

Speedball Mid-Fire

The one to reach for when you want the surface to look aged rather than polished. Forgiving by metallic standards, which is a low bar, but real.

Every one we stock

The nine that fire to an actual metal surface. Four makers, one row.

Amaco, Mayco, Spectrum and Speedball together. Shown in one row rather than split by maker, because with a handful from each the brand is the least interesting thing about them.

Amaco Potter's Choice Palladium glaze test tile, fired at The Clay HoleA pot fired in Amaco Potter's Choice Palladium at The Clay Hole
Palladium

AmacoPotter's Choice

🟪 Purple Level

Tile #29

Studio favorite

A metallic glaze that fires to a mirror. Not a shimmer or a sheen, an actual reflective surface, which is rare in mid-fire and is the reason this glaze exists.

Amaco Potter's Choice Saturation Gold glaze test tile, fired at The Clay HoleA pot fired in Amaco Potter's Choice Saturation Gold at The Clay Hole
Saturation Gold

AmacoPotter's Choice

🟪 Purple Level

Tile #39

Good on texture

A dark gold that fires closer to bronze than to yellow, with a satin matte surface rather than a shine. It reads as metal that has been aged rather than polished.

Mayco Antique Brass glaze test tile, fired at The Clay HoleA pot fired in Mayco Antique Brass at The Clay Hole
Antique Brass

MaycoVarious Families

🟪 Purple Level

Tile #1

Studio favorite

A dark olive brown with a metallic sheen. Reads like tarnished hardware rather than like a glaze.

Spectrum Gold glaze test tile, fired at The Clay HoleA pot fired in Spectrum Gold at The Clay Hole
Gold

SpectrumVarious Families

🟪 Purple Level

No Tile

A bright metallic gold, even across a flat tile. Spectrum groups it with its Stoneware Metallics.

Spectrum Gold Rain glaze test tile, fired at The Clay HoleA pot fired in Spectrum Gold Rain at The Clay Hole
Gold Rain

SpectrumVarious Families

🟪 Purple Level

No Tile

Good on texture

A metallic gold that reads almost identically to Spectrum's Gold on a flat tile. The difference shows on a vertical form, because this one runs and Gold does not.

Spectrum Mirror glaze test tile, fired at The Clay HoleA pot fired in Spectrum Mirror at The Clay Hole
Mirror

SpectrumVarious Families

🟪 Purple Level

No Tile

Studio favorite

A dark gunmetal metallic with a genuinely reflective surface. Not a shimmer, an actual mirror.

Spectrum Pewter glaze test tile, fired at The Clay HoleA pot fired in Spectrum Pewter at The Clay Hole
Pewter

SpectrumVarious Families

🟪 Purple Level

No Tile

A gray metallic with dark mottling through it, which is exactly what tarnished pewter looks like.

Swipe or use the arrows, 9 in this row

The faux metallics

14

None of these is a metal surface. They are ordinary glazes that read as rust, patina or tarnish, and a few of them fool people at arm's length.

Because they are not true metallics, our rule about keeping metal off food does not apply to them. Each one's own page says what its maker rates it.

Mayco Matte Wrought Iron glaze test tile, fired at The Clay HoleA pot fired in Mayco Matte Wrought Iron at The Clay Hole
Wrought Iron

MaycoMatte

🟪 Purple Level

Tile #1

Good on texture Studio favorite

A near-black brown matte that breaks to a warm brown on the raised edges. Darker than Black Walnut, and the closest this line gets to black without being Black Matte.

Amaco Potter's Choice Ancient Copper glaze test tile, fired at The Clay HoleA pot fired in Amaco Potter's Choice Ancient Copper at The Clay Hole
Ancient Copper

AmacoPotter's Choice

🟪 Purple Level

Tile #11

Studio favorite

An iron red with a metallic shimmer over it. The color is deliberately unstable across a single surface, and that is the point: it goes dark brown wherever it thins over a raised edge, and it pools a deep yellow-green wherever it gathers in a recess. Flat open areas hold the copper. The overall read is a metal object that has been buried for a while and dug back up.

Coyote Fantasy Ancient Iron glaze test tile, fired at The Clay HoleA pot fired in Coyote Fantasy Ancient Iron at The Clay Hole
Ancient Iron

CoyoteFantasy

🟨 Yellow Level

Tile #1

Good on texture

A translucent brown with mesmerizing rivulets, Ancient Iron can display a dazzling array of colors. Under the right circumstances, amber, coffee, purple and blue tones can show across a surface, and gold crystals can even form in the areas where the glaze cools slowest.

Coyote Archie's Gun Metal Green glaze test tile, fired at The Clay HoleA pot fired in Coyote Archie's Gun Metal Green at The Clay Hole
Gun Metal Green

CoyoteArchie's

🟪 Purple Level

Tile #11

Good on texture

Coyote calls it one of its most popular and most versatile glazes. A very runny, richly varied green that can be unpredictable, sometimes creating both matt and gloss areas on a single pot. Combines beautifully with almost all Coyote Glazes, and explodes with crystals in a slow cool.

Mayco Matte Rusted Iron glaze test tile, fired at The Clay HoleA pot fired in Mayco Matte Rusted Iron at The Clay Hole
Rusted Iron

MaycoMatte

🟪 Purple Level

Tile #7

Good on texture Studio favorite

A dark red-brown with a metallic cast and a mottled, corroded look. Sits at the glossier end of a matte line.

Mayco Matte Satina Patina glaze test tile, fired at The Clay HoleA pot fired in Mayco Matte Satina Patina at The Clay Hole
Satina Patina

MaycoMatte

🟪 Purple Level

Tile #16

Good on texture Studio favorite

A soft blue-green matte with a patina-like mottle through it. Mayco calls it Satin Patina.

Amaco Potter's Choice Ironstone glaze test tile, fired at The Clay HoleA pot fired in Amaco Potter's Choice Ironstone at The Clay Hole
Ironstone

AmacoPotter's Choice

🟪 Purple Level

Tile #1

A glossy dark glaze that reads deep chocolate brown where it is thin and grows a beige-bronze float where it is thicker. The float is what separates it from an ordinary brown: on a full application there is metal in it.

Amaco Potter's Choice Iron Lustre glaze test tile, fired at The Clay HoleA pot fired in Amaco Potter's Choice Iron Lustre at The Clay Hole
Iron Lustre

AmacoPotter's Choice

🟪 Purple Level

Tile #12

Good on texture Studio favorite

Brown where it is thin, with blue-gray floats coming up where it is thick. Amaco describes it as a more restrained relative of a straightforward blue glaze, and restrained is the right word: the blue is present but it never takes over.

Amaco Potter's Choice Cosmic Oilspot glaze test tile, fired at The Clay HoleA pot fired in Amaco Potter's Choice Cosmic Oilspot at The Clay Hole
Cosmic Oilspot

AmacoPotter's Choice

🟧 Owner Only

Tile #35

Good on texture

A dark glaze carrying shimmering flecks that pull into streams and patches as they move. Amaco compares it to a hare's fur glaze, one of the old Chinese temmoku effects where iron separates during cooling and draws fine streaks down the pot.

Amaco Potter's Choice Cosmic Gold Dust glaze test tile, fired at The Clay HoleA pot fired in Amaco Potter's Choice Cosmic Gold Dust at The Clay Hole
Cosmic Gold Dust

AmacoPotter's Choice

🟪 Purple Level

No Tile

A gold glaze with sparkle in it, and under direct light the sparkle carries flecks of red and brown rather than being a single flat glitter. It is one of the newer glazes in the line and it reads more like a mineral than a metal.

Coyote Copper & Iron Saturated Iron glaze test tile, fired at The Clay HoleA pot fired in Coyote Copper & Iron Saturated Iron at The Clay Hole
Saturated Iron

CoyoteCopper & Iron

🟩 Green Level

Tile #5

A rich, dark iron glaze. Usually has a smooth, deep brown surface, but can also become reddish, especially when slow cooled.

Coyote Copper & Iron Rust Brown glaze test tile, fired at The Clay HoleA pot fired in Coyote Copper & Iron Rust Brown at The Clay Hole
Rust Brown

CoyoteCopper & Iron

🟨 Yellow Level

Tile #4

Good on texture Studio favorite

A light brown glaze with a mottled, satin surface. Less breaking than the Shino glazes but with more variation than the Satins.

Swipe or use the arrows, 14 in this row

From here down, true metallics only

Everything that follows is about the nine at the top of this page. The faux metallics are ordinary glazes, and each one behaves like the family it came from.

Metallic Glazes at The Clay Hole: Thickness is the whole game

Thickness is the whole game

With most glazes thickness shifts the result. With a metallic it decides whether you get metal at all. Too thin and the metal never saturates, so you get a flat brown or grey with no reflectivity, and people usually blame the glaze. Too thick and the same saturation that makes the shine makes it run.

Three even brushed coats is the starting point for most of these, and even coats matter more here than anywhere else, because a metallic reports every place your brush hesitated as a stripe. Dip if you can. Where you cannot, load the brush properly and work in alternating directions.

Metallic Glazes at The Clay Hole: Put something under the pot

Put something under the pot

A saturated glaze is a fluid glaze. Metallics are among the most likely things in the studio to end up welded to a kiln shelf, and the ones that run tend to run a long way once they start.

Keep them well up off the foot, at least a quarter inch of bare clay, and put a cookie or a piece of scrap shelf under anything you are unsure about. Treat the first firing of any metallic on any new form as a test, because the form decides where the glaze stops as much as the recipe does.

Metallic Glazes at The Clay Hole: Where a metallic actually shines

Where a metallic actually shines

The reflective surface needs something to reflect. On a flat, smooth wall a metallic can read as a dull dark field, while the same glaze over throwing rings, a faceted edge or a carved band catches light on every ridge and turns the pot into something that changes as you walk past it.

The other trick is restraint. A whole pot in metallic often reads as heavy, but a metallic band against a matte or satin colour reads as deliberate. Some of the best pieces to come out of these kilns use a metallic on a third of the surface and nothing else clever at all.

Common questions

Why did my metallic come out dull brown?

Almost always too thin. The metal never saturated, so it fired as a colored glaze instead of a metallic one.

How many coats?

Three even ones for most of these. Check the glaze page, because a few want more and a few run if you give them more.

Are metallic glazes food safe?

Treat them as decorative unless the glaze page says otherwise. Use a metallic outside and a proven liner inside.

Will they run?

They are among the most likely glazes here to run. Keep them off the foot and put something under the pot.

Why do mine look streaky?

A metallic shows brush marks more than any other surface. Dip where you can, and brush in alternating directions where you cannot.

Where are the raku metallics?

On the raku page. Those fire in a completely different process and never go in the glaze kilns.

Can I layer a metallic over another glaze?

Yes, and it is often the best way to use one. Test it on a tile first, because a metallic over a fluid glaze can move a long way.

About these images and what your pot will actually look like

We have done our best to represent every glaze here accurately, and you should still expect your pot to look different from what is on this screen.

Our glaze tile images are digitally created. They are built to show the character of a glaze, not to be a color match.

A screen is not a printout, a printout is not a test tile, and a test tile is not a finished pot. Each step in that chain shifts what a glaze looks like, sometimes a lot.

On top of that, the pottery itself changes the result: the clay body, how thick the glaze went on, whether it was brushed, dipped or sprayed, what was layered under or over it, where the piece sat in the kiln, how hot that spot ran, how fast it cooled, what was fired next to it, and how much texture the surface had. Two pots glazed from the same jar on the same day can come out different.

Treat every image here as a starting point, and treat a test tile fired on your own clay as the real answer.

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