Gilding the edges of a book is less a matter of laying gold on paper than of preparing a small, firm, perfectly even surface. Every hollow, loose page, and rough fibre remains visible beneath the metal. The work is therefore done in the press, slowly and with very little moisture.
For a first attempt, gild one edge only—usually the top edge or fore-edge—and practise on a spare sewn text block if possible. A bright, polished edge demands more preparation than a softly satin-finished one, but both depend on the same essentials: aligned leaves, restrained sizing, and a surface that is already smooth before the gold arrives.
Before you begin
This method suits a completed book block with a sound binding and edges that have been trimmed or carefully brought to a consistent shape. Do not gild a fragile, damp, newly decorated, or loosely sewn book. Water, pressure, and repeated handling can mark paper and disturb the covering structure.
Choose your edge finish before choosing the size. Traditional water gilding gives the most luminous result, but it involves several prepared layers and a damp surface that must be judged correctly. An adhesive or oil-size method is more forgiving in some workshops and can be used with loose or transfer leaf, though it generally produces a less deeply burnished surface. Transfer leaf is easier to handle than loose leaf; genuine loose gold gives a particularly delicate, continuous surface when handled well.
If the book is valuable or structurally weak, leave the work to a conservator. Edge gilding is not a disguise for damaged edges, and clamping can permanently compress an already compromised text block.
Photo by Jo Anaya on Unsplash.
Materials and arrangement
Gather the following before setting the book in the press:
- A finishing, lying, or other book press capable of holding the block firmly and evenly.
- Two clean, smooth backing boards, slightly larger than the book edge.
- A fine scraper, card scraper, or very fine abrasive paper suitable for the paper and binding.
- A soft brush, a clean cloth, and a little talcum powder for controlling leaves and reducing tack on adjacent surfaces.
- A suitable edge size: prepared glair or another water-based size for traditional water gilding, or a compatible adhesive/oil size for an adhesive method.
- Bole or another coloured ground if using water gilding. Red or yellow-brown grounds are traditional because small breaks in the gold are less conspicuous.
- Gold leaf, transfer leaf, or metal leaf intended for the chosen size.
- A gilder’s tip for loose leaf, a soft brush for placing and cleaning, and an agate burnisher for the final polish.
Keep the work area free from draughts. Loose leaf moves with the smallest current of air, and dust caught in the size will become a permanent blemish.
1. Inspect and align the book block
Close the book and examine the edge in good, angled light. Look for stepped leaves, dents, adhesive lumps, and places where the paper springs away from the neighbouring leaves. The edges must be brought into alignment before the book is clamped; pressure alone will not correct a badly uneven block.
If the binding permits, fan the leaves gently and use a small amount of talcum powder to keep them from gripping one another while they settle. Do not force a tight or decorated binding open. Place the book between the backing boards so that the edge to be gilded is exposed and the boards support the block immediately beside it.
Tighten the press gradually. The pressure should be firm enough that the leaves cannot shift, but not so great that the paper is crushed or the boards bow. Check both ends of the edge. A narrow gap at one end will produce a thin or missing patch of gold.
2. Smooth the edge before applying any size
The surface beneath the gold should already be smooth enough to catch a muted reflection. Begin with a scraper or a suitably fine abrasive, using light, even strokes along the edge. Work across the grain and direction of the paper as needed, but avoid digging into individual leaves.
Remove dust often and inspect the surface from several angles. Scraping a raised leaf flat can create a hollow beside it, so take off only what is necessary. Fine sanding is useful for the last irregularities, but excessive sanding rounds the edge and can loosen paper fibres.
A bright gilt edge cannot conceal scratches. If the prepared edge still looks rough, stop and correct it now. Later layers will follow the same defects rather than fill them reliably.
3. Choose and apply the ground
For a traditional water-gilt edge, apply a very thin adhesive or preparatory coat followed by thin coats of bole. The bole should be smooth and even, not a thick painted film. Allow each layer to dry fully before adding the next, then gently polish the dry ground with a soft brush or suitable burnishing tool until it is even.
The exact preparation depends on the paper, the recipe, and the size being used. Glair, made from separated and settled egg white, is a traditional water-based size, but it must be clean, well strained, and used sparingly. A size that is too wet can cockle paper or creep between leaves; one that is too weak will not hold the gold.
For an adhesive or oil-size edge, first seal the prepared surface if the chosen system calls for it. Apply the size in an extremely thin, uninterrupted coat. A heavy coat stays soft, gathers brush marks, and can glue neighbouring leaves together. Follow the manufacturer’s drying guidance for modern products, or the working instructions for a traditional recipe. Gild only while the size has the correct tack: not wet enough to move under the leaf, and not dry enough to reject it.
Test the size on a scrap of paper or a small area of the ground. The gold should settle without sliding and should not leave a visible ridge around its edges.
Photo by melanfolia меланфолія on Unsplash.
4. Lay the gold
With loose leaf, prepare the gilder’s tip by lightly passing it over clean hair or a compatible surface so the leaf will adhere to the tip rather than fold into a ball. Keep the leaf supported by its booklet until the moment of use. Cut or tear pieces a little larger than the area they must cover.
Touch the leaf down gently onto the sized edge. Do not rub it into place at first. Work in overlapping pieces, keeping the overlaps modest and avoiding a thick ridge. Place enough gold to cover the edge continuously, but resist repeatedly brushing a piece that has already begun to adhere.
Transfer leaf is handled with its backing paper. Set it against the tacky edge, press lightly through the backing, and lift the paper away according to the leaf’s instructions. It is convenient for small work, but the backing can reveal any unevenness in the ground, so careful preparation remains essential.
If a small gap appears, patch it with a fresh piece while the size is still receptive. Save clean fragments for such repairs. Gold that has fallen into dust or touched adhesive outside the edge should not be brushed back onto the work.
Leave the book clamped while the gold settles. The correct interval depends on the size: water-based layers may need to lose their surface moisture, while oil size requires a longer, controlled wait. The gold should no longer move under a cautious touch, but it should not be left until the size has completely lost its bite.
5. Set, clean, and burnish
Once the gold is secure, use a very soft brush to remove loose fragments from the edge and backing boards. Brush outward from the book rather than dragging debris across the gilt surface. If the gold lifts in broad flakes, the size was probably too dry, too thin, or uneven; stop and repair rather than continuing to burnish.
For a traditional water-gilt finish, an agate burnisher may be used once the surface is dry and firm. Hold the tool nearly flat and make light, overlapping passes along the edge. Begin with little pressure. Gradually increase it only if the surface responds evenly. A burnisher pressed into a rough patch will polish the high points and make the hollows more obvious.
Burnish in one direction, then change the angle of the book rather than twisting the tool sharply. The aim is a continuous, quiet sheen, not a worn-through brilliance. Some edges are intentionally left with a satin finish; in that case, use a soft brush and minimal burnishing.
Open the press carefully and release the book without flexing the gilded edge. Separate any leaves that have caught together with a thin folder or other appropriate tool, working from the un-gilded side where possible. Do not snap the pages apart.
Photo by melanfolia меланфолія on Unsplash.
Water gilding or adhesive size?
Water gilding is the better choice when you want a traditional, highly polished edge and are prepared to spend time on the ground and timing. It rewards a very smooth surface but is sensitive to excess moisture and handling.
Adhesive or oil-size gilding is useful when a less elaborate preparation is preferred, or when transfer leaf makes loose-leaf handling impractical. It can produce a handsome, restrained edge, though the final surface may be more satin-like and less suited to vigorous burnishing. Always match the leaf to the size: a product intended for oil size should not be placed onto wet glair, and vice versa.
For a small handmade book, a coloured edge, graphite-toned finish, or thin waxed edge may be the wiser choice. These finishes require less pressure and can sit more quietly with rough, deckled, or intentionally irregular paper. Gold is most convincing when it belongs to the book rather than merely announcing the labour spent on it.
Common mistakes to avoid
- Clamping an uneven block: the press hides the problem until the gold makes it visible.
- Using too much liquid: moisture can cockle the paper and seep between leaves.
- Skipping the final smoothing: gold follows scratches, dents, and loose fibres.
- Applying size too thickly: a soft ridge will remain beneath the leaf and may never harden evenly.
- Working in a draught: loose leaf folds, tears, and lands where it should not.
- Burnishing too soon: the tool can drag or remove incompletely set gold.
- Over-burnishing: repeated pressure can wear through the leaf and flatten the edge’s character.
A good gilt edge is made largely before the gold is opened. Prepare the text block patiently, use less size than seems necessary, and let each stage become stable before moving to the next. The finished edge should feel smooth beneath the finger and show a measured glow when the book is tilted—not a thick coating, but a fine skin of light held by the paper beneath.