Paper marbling learning plan: a weekend schedule

What to take away

Friday evening: alum and size

Mix the size and let it stand overnight so it hydrates fully. Carrageenan, the traditional seaweed size, and methylcellulose, the cellulose-based alternative, both need that time; mix whichever you use to the strength its supplier specifies and note the figure down. A size used within an hour of mixing behaves differently from the same size the next morning, and inconsistency between sessions is what makes marbling feel unlearnable.

Alum the paper the same evening. The alum goes into warm water at the strength your supplier specifies, is applied with a sponge, evenly, on one side only, and the sheets then dry flat — mark the alum side so you know which one takes the color. Printmaking paper and Japanese kozo take the bath well; a lightweight text sheet will tear as soon as it touches the size. Alumed paper is best used within a day or two.

Saturday morning: one pattern, twenty sheets

Make the stone pattern and nothing else. Drop color, lay a sheet, lift, rinse, hang. Repeat. The color is acrylic, gouache, watercolor or ready-made marbling paint, thinned until it flows off the brush, and every color needs ox gall — a surfactant that lowers the surface tension of the size so the drop opens instead of sinking. Add it drop by drop and test on the bath: a drop that sits as a tight circle needs more, and one that spreads until the colors run together has had too much.

Write down the ratios you actually used. Not the ones on the packet.

Saturday afternoon: raking and combing

Add a rake pass, then a comb pass, then a comb pass at right angles. A rake is a bar of pins and a comb a row of teeth, and each is drawn steadily across the bath in one movement; spacing between the pins or teeth sets how fine the lines come out. That sequence produces nonpareil and the other combed patterns — the family that dominated nineteenth-century commercial marbling, with French curl and Spanish wave alongside it — and it will show you immediately whether your bath is holding a line.

Skim the surface between every sheet. A skipped skim is the commonest cause of a broken pattern.

Sunday morning: rinsing and drying

Rinsing is not optional. Surplus size left on a sheet dries to a tacky film that attracts dust and sticks to whatever it is stacked against. Rinse gently, hang or lay to dry, and resist the urge to blot a freshly marbled surface.

Dry sheets will cockle. That is expected, and the fix is Sunday afternoon.

Sunday afternoon: humidify and flatten

Flattening a cockled sheet is a documented process with real timings. The Park Service's Conserve O Gram guidance on how to flatten folded or rolled paper puts the whole operation at approximately twenty-four hours. Humidification takes two to four hours and needs periodic attention; flattening happens overnight and needs attention only in the first two hours.

It also lists materials that should go to a professional conservator rather than be treated this way: easily disturbed media such as chalk, charcoal and pastels, coated papers, tracing paper and anything with iron gall ink.

For your own fresh sheets none of those exclusions apply, so the process is simply: relax, then press flat under weight between blotters — clean, dry ones. Change them once partway through, or sooner if they feel damp; damp blotters left in place slow the drying and can mark the surface.

If your sheets are too large

Oversize sheets are a storage problem before a drying problem. Park Service guidance on rolled storage for oversized paper materials covers when rolling is the right answer, how to do it, which matters if you work larger than your shelves.

The surfaces this weekend needs are described in work surfaces for decorative paper, and the background to every step above is in paper marbling explained.

Common questions