Surface and decoration

The History and Tradition of Makers Marks

Potters have been signing their work for about as long as there has been work to sign, and the reasons have changed completely along the way. Ownership, tax, guild law, factory accounting, forgery, and eventually pride. Here is where the practice came from, what a mark is for now, and how to make one that still reads after a firing.

A mark is a stamp, a carved initial or a signature pressed into the foot while the clay is leather hard. Keep it small, keep it shallow enough not to weaken the base, and use the same one every time.

Where the practice came from Five ways to mark a pot Three videos, none of them ours
How to make one Where and when to apply it Three things that go wrong
The underside of a pot showing a pressed maker's stamp beside a carved initial
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Where the practice came from Why mark a pot at all Five ways to mark a pot Making your own stamp Where and when to apply it Designing a mark that reads What goes wrong The whole idea, quickly Making one Three things that go wrong Questions we get asked Keep going

Where marks came from, what they are for now, and how to make one that reads.

The whole idea

A mark is a promise about who made it

For most of history a mark on a pot was not about pride. It was about accountability: which workshop, which tax district, which guild, which member of a factory line.

It only became a signature relatively recently, when the person who made the pot and the person who sold it became the same person.

What has not changed is the mechanics. A shallow impression in leather-hard clay, small, in the same place every time, on a pot you are willing to be identified with.

Start to finish

Making one

How to Make Your Own Pottery Maker's Mark Florian Gadsby
  1. Decide what it says. Initials, a symbol, or a short name. One or two characters is plenty.
  2. Carve it backward into a small plug of clay. Backward, or the pot reads it in a mirror.
  3. Cut deeper than feels right. Detail softens at every stage, so a shallow carving disappears entirely.
  4. Bisque the stamp and leave it unglazed, so it does not stick to wet clay.
  5. Press it into leather-hard clay on the foot, supporting the base from inside so you do not distort the pot.
  6. Use the same mark every time, in the same place. A mark that changes is not a mark.
If it went wrong

Three things that go wrong

It came out backward

The stamp was carved the way it reads rather than mirrored. Check by pressing it into a scrap before you commit it to a pot, which takes five seconds and saves the whole batch.

The glaze filled it in

Detail softens three times over: pressing, then glaze, then the melt. A mark with fine lines and tight counters reads as a blur. Simpler and deeper survives.

It cracked the base

Pressing hard into an unsupported floor thins it and stresses it. Support the inside of the base with your other hand, and stamp at leather hard rather than when it is stiff.

The long version

Where the practice came from

Marks have meant different things in different centuries, and almost none of those meanings was personal pride.

5 Ways to Sign Your Pottery! ClayShare - Jessica Putnam-Phillips Half an hour going through the methods properly, which is more than most of this gets anywhere.
  1. The oldest marks were administrative. Potters' marks appear on ancient wares across the Mediterranean and the Near East, and their job was to identify a workshop or a batch rather than a person. Accounting, not authorship.
  2. Roman pottery took it furthest. Terra sigillata, the standardized red ware traded across the empire, was routinely stamped with workshop names. Those stamps are now one of the most useful dating tools archaeologists have.
  3. Chinese reign marks dated the piece to an emperor. Characters on the base recording the reign the piece was made in, which is why so much later work carries earlier reign marks. Some of that was homage and some was straightforwardly commercial.
  4. Japanese practice made the seal personal. A carved chop pressed into the clay, often belonging to an individual potter and sometimes passed down, which is the closest historical ancestor of the stamp most studio potters use now.
  5. European factories marked for quality control. Crossed swords, crowns, anchors, and alongside them the small painters' and throwers' marks that tracked which employee did which part. Those were internal accounting, and collectors now read them as history.
  6. The studio pottery movement made it a signature. Once the maker and the seller became the same person, the mark stopped being a record for somebody else and became a statement about who made this. That is the version most potters have inherited, and it is barely a century old.

The pattern worth noticing

Every era marked pots for whatever the pressing question was. Who owes tax, which workshop, which reign, which employee, which artist. The mark on the bottom of a mug you make this week is the current answer to a very old question.

The reasons

Why mark a pot at all

Some of these are sentimental and some are entirely practical.

So it comes back to you

The most immediate reason in a shared studio. Fifty mugs on a shelf and a firing schedule nobody can remember. A mark is how yours finds its way home.

So you can learn from it

A mark plus a date tells you what you were making a year ago and how the glaze behaved. It turns a shelf of pots into a record you can actually read.

Because somebody will ask

A pot given away outlives the conversation about who made it. The mark is the only part of the story that stays attached.

If you sell

It matters more than people expect. Buyers look at the bottom, and an unmarked pot reads as anonymous in a way that affects what it is worth.

To be found again

The whole of ceramic history is partly readable because people marked things. A mark is a small bet that somebody, sometime, will want to know.

And a reason not to

Plenty of excellent potters do not mark anything, on the grounds that the pot should stand without a name on it. That is a real position and worth respecting rather than arguing with.

The methods

Five ways to mark a pot

  1. A pressed stamp. The classic, and the most consistent. A bisque-fired clay stamp pressed into leather-hard clay. Identical every time, fast, and it survives glaze better than anything else because the impression has depth.
  2. A carved signature. Scratched into the foot with a needle tool while the clay is leather hard. Personal and immediate, different every time, and easily lost under a thick glaze.
  3. Underglaze, painted or stamped on. Reads clearly because it is color rather than shadow, and it is the method that works on a flat foot with no depth to it. It can blur if the glaze over it moves.
  4. An oxide wash rubbed into a carved mark. The best of both. Carve it, then wipe iron or cobalt wash into the lines and clean the surface back. The mark reads dark and sharp even under a glaze.
  5. A stamp cut into a rubber or plastic blank. Cheap, precise, and it lets you include lettering finer than you could carve into clay. Worth knowing it wears faster than a fired clay stamp does.

What most studio potters end up doing

A pressed stamp for the maker's mark and a scratched year beside it. The stamp is the identity and never changes, the scratch is the date and changes annually, and together they answer both questions somebody will have about the pot.

Doing it

Making your own stamp

Creating a Clay Signature or Makers-Mark Stamp for Pottery KaransPotsAndGlass Twelve minutes on the making itself, including the mirroring that catches everybody once.
  1. Draw it at final size first, on paper. Most designs that look good large fall apart at half an inch across.
  2. Roll a small plug of clay and flatten one end. A handle on the back makes it far easier to press evenly.
  3. Carve it mirrored. Write it backward, or draw it on paper, turn the paper over, and trace through.
  4. Cut deeper than you think you need. Every stage softens the detail, so a crisp shallow carving becomes a vague dent on the pot.
  5. Test it in scrap clay before you fire it. This is the step that catches a mirrored mistake while it is still fixable.
  6. Let it dry slowly and bisque it. A thick plug of clay dried fast will crack.
  7. Leave it unglazed. A glazed stamp sticks to wet clay and pulls the impression apart as it comes away.
  8. Make two while you are at it. Stamps get lost, and carving a matching replacement later is harder than making a spare now.
On the pot

Where and when to apply it

  1. Leather hard, not wet and not stiff. Wet clay distorts around the stamp, and stiff clay cracks rather than taking an impression.
  2. On the foot, usually. Inside the foot ring on a thrown pot, or on the underside of a hand-built piece.
  3. Support the inside of the base with your other hand while you press. This is what prevents a bulge on the inside floor and a stress crack later.
  4. Press straight down and lift straight up. Any rocking smears the impression.
  5. Keep it away from the glaze line if you wax the foot, or the mark ends up half waxed and half glazed.
  6. Same place, every pot. Consistency is most of what makes a mark feel deliberate rather than incidental.

The date question

Scratching the year next to the mark costs nothing and is worth more than people expect. In two years it tells you which glaze batch, which clay body and roughly what you knew at the time. Anybody who owns the pot later will want it too.

The design

Designing a mark that reads

A maker's mark is a small piece of graphic design that has to survive being pressed, glazed and melted.

Simpler than you want it to be

One or two characters, or one shape. Every extra element is another thing to blur. The marks that last centuries are almost all extremely simple.

Thick lines, open counters

The enclosed spaces inside letters fill with glaze first. An A with a tiny triangle in it becomes a blob; a wider one survives.

Avoid fine serifs and script

Both rely on thin strokes, and thin strokes are the first thing to disappear. Block shapes read at a fraction of the size.

Think about it upside down

People look at the bottom of a pot in whatever orientation it lands. A mark with an obvious top edge helps more than it sounds.

Test it under your actual glaze

Stamp a test tile, glaze it the way you glaze a foot, and fire it. What a mark looks like in raw clay tells you almost nothing about how it fires.

Pick something you will still want

The point of a mark is that it does not change. A design tied to a phase you are going through is a design you will be stuck with, or will abandon and lose the continuity of.

Read this after a bad one

What goes wrong

Mirrored

Carved as it reads rather than backward. Everybody does this once. Press it into scrap before you bisque the stamp and it never happens twice.

Illegible after glazing

Too fine, too shallow, or both. Glaze pools in an impression and rounds every edge. Deeper and simpler, or rub an oxide wash into it.

A bulge inside the pot

Pressed without supporting the base. The clay had to go somewhere and it went up into the floor of the pot.

A crack from the mark

Stamped too late, when the clay was past leather hard, or pressed hard into a thin base. Both put stress into a spot that then opens in the firing.

The stamp stuck to the pot

Clay too wet, or a glazed stamp. A pinch of cornstarch on the face of the stamp fixes the first, and leaving the stamp unglazed fixes the second.

Smeared

Rocked instead of lifted. Straight down, straight up, no twist.

Questions we get asked

The ones that come up at the tables

When should I stamp the pot?

At leather hard. Wet clay distorts around the stamp, and clay that has gone past leather hard cracks instead of taking a clean impression. Support the inside of the base while you press.

Why did my mark come out backward?

Because the stamp was carved the way it reads rather than mirrored. Draw the design on paper, turn the paper over and trace through, then press the stamp into scrap clay to check before you bisque it.

My mark disappears under glaze. What do I do?

Carve deeper and simplify the design, or rub an iron or cobalt wash into the impression and wipe the surface back. The wash sits in the lines and reads dark and sharp even under a thick glaze.

Should I glaze my stamp?

No. Bisque it and leave it unglazed. A glazed stamp sticks to wet clay and tears the impression as it lifts. A pinch of cornstarch on the face helps if it still grabs.

Do I need a stamp, or is signing enough?

Either works. A scratched signature is personal and immediate; a stamp is consistent and survives glaze better. Many potters use both, with the stamp as the permanent identity and a scratched year beside it.

Should I add the year?

It costs one scratch and it is worth more than people expect. Two years later it tells you which clay and which glaze batch, and anybody who owns the pot afterward will want to know too.

How big should a maker's mark be?

Small. Around half an inch across for most work, scaled to the pot. What matters far more than size is that the design is simple enough and cut deep enough to survive glazing.

Is it wrong not to mark my pots?

No. Some very good potters deliberately leave work unmarked, on the view that the pot should stand on its own. The practical counterargument in a shared studio is that a mark is how your work finds its way back to you off a full shelf.

One last thing

The part that outlives the pot

Roman workshop stamps are still legible two thousand years later, on pots whose makers had no expectation that anybody would care. They were doing accounting. What survived was the identity attached to the accounting.

Your mark is doing the same unglamorous job. It gets your mug off a shared shelf, it tells you what you were making last spring, and it answers a question somebody might ask long after the conversation is over. Carve it simple, cut it deep, and put it in the same place every time.

Carve it mirrored, cut it deeper than feels right, bisque it unglazed, and press it into leather-hard clay while supporting the base. Same mark, same place, every time.

If you want the history and the five marking methods, switch to the Comprehensive Version at the top of the page.