Slip trailing is a decorative technique where thick, colored slip is squeezed through a nozzle to draw raised lines directly onto leather-hard pottery. The raised lines stay three-dimensional after firing, creating texture as well as color. It’s one of the oldest slip decoration methods — used in English slipware for centuries and still one of the most expressive surface tools available.
What You Need
Slip trailer — a soft rubber or plastic bulb with a narrow nozzle tip. Squeeze bottles with fine tips also work.
Decorating slip — same clay body as the piece, tinted with mason stain or oxide. See: How to Make Decorating Slip
Leather-hard pottery — the standard stage for slip application
Slip Consistency
Trailing slip needs to be thicker than standard decorating slip — closer to yogurt consistency than cream. Too thin and the lines spread flat and lose their raised profile. Too thick and it clogs the nozzle or pulls away from the surface as you trail. Test by trailing a line on a scrap piece — it should sit up slightly off the surface without spreading and hold its shape as it dries.
Step-by-Step
1. Fill the Trailer
Squeeze the bulb to collapse it, submerge the tip in the slip, then release — the slip is drawn in. Don’t overfill; a half-full trailer gives you better control than a completely full one. Tap the tip on the rim of the slip container to remove any air bubble at the nozzle before you start.
2. Practice the Motion First
Trail test lines on a scrap piece or canvas before working on a finished pot. Get a feel for how fast you need to move relative to how hard you squeeze. Moving too slowly with too much pressure creates thick puddles; moving too fast with too little pressure creates broken, thin lines.
3. Trail Directly onto Leather-Hard Clay
Hold the trailer just above the surface — not touching it. Squeeze steadily and move in a continuous motion. For curved surfaces, rotate the piece on a banding wheel as you trail. Keep your elbow braced for stability on long lines.
Tip: Trail in one direction per line without stopping. If you stop mid-line the slip builds up into a blob at that point.
4. Let Dry Without Touching
Trailed slip is fragile until fully dry. Don’t touch the surface or cover it with plastic directly. Let it air dry slowly — the slip and the clay body need to dry at the same rate to prevent the lines from cracking or popping off.
Design Approaches
Feathering
Trail parallel lines of alternating colors across a freshly slipped surface, then drag a needle tool or feather perpendicular to the lines while the slip is still wet. The lines drag into each other, creating a feathered pattern. A classic English slipware technique.
Marbling
Apply a background slip coat, then trail contrasting colors on top while both are still fluid. Tilt and rotate the piece to let the colors flow and merge. Results are unpredictable and unique each time.
Freehand Drawing
Use the trailer like a pen to draw lines, text, or patterns. Works best with a practiced hand and consistent slip thickness. Useful for signatures, botanical line drawings, and geometric patterns.
I am a visually impaired ceramic artist. I have been making for around 8 years now. I specialize in functional colorful pottery. Mainly nerikome and other decorative processes.
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