What is the difference between water gilding and oil gilding, and why does water gilding produce a brighter burnished finish?

Water gilding and oil gilding differ in the adhesive mechanism that bonds gold leaf to the substrate. In water gilding, the substrate is prepared with multiple coats of traditional gesso (calcium sulfate hemihydrate in rabbit skin glue solution) sanded smooth, then coated with bole (iron-oxide clay in rabbit skin glue). To apply gold leaf, the dried bole surface is briefly moistened with clean water or a water-alcohol mixture using a soft brush. The moisture reactivates the rabbit skin glue in the bole and gesso layer below. When gold leaf (which adheres to virtually any slightly tacky surface) is laid onto the moist bole, the moisture under the leaf evaporates over seconds to minutes and the rabbit skin glue gels back to its solid, adhesive state, permanently bonding the gold to the bole surface. Because water gilding produces gold directly bonded to the smooth, hard gesso surface, the gold layer can be burnished with an agate or bloodstone burnisher: the burnishing tool applies local compressive stress to the gold surface, plastically deforming the micro-scale roughness of the gold leaf surface into a smoother, more mirror-like surface. This produces the characteristic high-brilliance, almost liquid-metal appearance of burnished water gilding that cannot be achieved by any other gilding method. In oil gilding, a gold size (either Japan gold size — an oil-varnish blend — or water-based size — an acrylic dispersion) is applied to the surface and allowed to reach the correct tack level before gold leaf application. Japan gold size has a tack window of approximately 12–24 hours after application; water-based quick-dry sizes have tack windows of 15 minutes to 1 hour. The gold leaf adheres to the tacky size surface. After the size has fully cured, the gold is permanently bonded. Oil-gilded surfaces cannot be burnished because the gold is bonded to a soft, flexible size layer rather than a hard gesso layer — burnishing would distort the size rather than polish the gold surface.

What does bole colour do to the final appearance of burnished gold, and which bole should gilders document?

Bole is a clay-based coating applied over gesso before water gilding. Traditional bole is an iron oxide-pigmented clay (typically kaolinite base with iron oxide colorant) mixed with rabbit skin glue. Three bole colors are most commonly used: red bole (from Fe2O3 hematite, ranging from orange-red to deep crimson); yellow bole (from goethite Fe2O3·H2O, yellow-ochre); and black bole (from magnetite Fe3O4 or carbon). The bole colour has a measurable effect on the final appearance of the burnished gold layer because gold leaf is extremely thin — approximately 100–120 nanometers for standard 23.75 karat double gold — and some incident light penetrates through the gold layer and is absorbed and re-emitted by the bole color below. Red bole produces a warmer, slightly rosier gold that historically references Roman and Byzantine gilding traditions and is preferred for icon painting and manuscript illumination. Yellow bole produces the brightest, most vibrant gold color because the yellow bole adds minimal contrast with the gold layer. Black bole produces a cooler, deeper gold color that appears more antique and is preferred for furniture gilding and architectural gilding where a rich, slightly darkened gold is desired. Documentation of bole color, bole manufacturer, bole dilution with rabbit skin glue (percentage glue in the bole paste), number of bole coats, and any bole burnishing before gold application forms part of the complete water gilding recipe.

How does the Apple Tax affect gilding Patreon creator income?

Gilding creators build audience primarily through Instagram process photography and YouTube long-form tutorials. The iOS concentration is high: Instagram gilding and illumination process photography: 70–80% iOS; YouTube gilding tutorials: 58–70% iOS; TikTok gilding time-lapse and reveal content: 72–82% iOS. Beginning November 1, 2026, Apple charges Patreon 30% on every subscription payment processed through the iOS app. At $200/month with 68% iOS: approximately $40.80/month ($489.60/year) in Apple fees. At $350/month with 72% iOS: approximately $75.60/month ($907.20/year). At $500/month with 75% iOS: approximately $112.50/month ($1,350/year). Enable Patreon's web-only billing toggle in Creator Settings before October 31, 2026 and update all social media bio and channel links to the Patreon web URL.

Explainers · 2026-07-04

Patreon for gilding creators: water gilding vs oil gilding, gesso and bole preparation, gold leaf karat and alloy composition, burnishing mechanics, shell gold preparation, iOS rates, Apple Tax 2026

Gilding Patreon tiers deliver documentation that finished gold surface photography cannot carry: gesso formula and coat count, bole colour selection and its effect on gold appearance, moisture application technique for water gilding, size tack window management for oil gilding, and burnishing tool selection and pressure. The gilding audience sits in the 60–82% iOS range across Instagram, YouTube, and TikTok — the November 1, 2026 Apple Tax warrants action before October 31.

Creator subtypes and tier structures

Manuscript illuminators practice water gilding on vellum, pergamenata, or heavy-weight paper in the traditions of medieval and Byzantine manuscripts. They apply gesso to the text area, lay gold leaf, burnish, then paint surrounding miniatures in gouache or egg tempera. Documentation covers gesso recipe (slaked plaster vs chalk, fish glue vs rabbit skin glue, ratios), gesso burnishing before gold application, moisture application method (breathed on vs water-dilute alcohol brush), gold leaf thickness (single vs double gold, booklet gold vs patent gold), agate burnisher shape selection, and how humidity affects the water gilding window. Patreon delivers the reasoning layer: why humid studio days require briefer moisture application, why certain vellum brands require more gesso coats.

Water gilders (furniture and frame): apply traditional gesso and bole to carved wood frames, furniture, and architectural millwork for burnished gold leaf finish. Their process involves many gesso coats (often 10–20), interspersed with sanding, to build a flawlessly smooth ground, then multiple bole coats in layers of different colours. They work with patent gold (gold leaf attached to a tissue carrier) or loose gold leaf transferred by gilder's tip. Documentation covers woodworker substrate preparation (sealing knots, grain filling), gesso application sequence, bole colour layering, gold leaf handling technique, and burnishing sequence (areas gilded first are burnished first while other areas cure). Tier examples: Pattern tier ($8/month) — monthly photo series with text description of each work step; Recipe tier ($22/month) — complete written recipes for each session including gesso formula, bole formula, and gold leaf specification; Masterclass tier ($65/month) — full recorded session walkthroughs with annotated documentation.

Oil gilders work on substrates incompatible with water gilding (outdoor architectural surfaces, metalwork, finished painted furniture) using oil-based or water-based gold size. Their documentation is less about gesso preparation and more about size brand selection, correct tack window assessment, and substrate priming. Some oil gilders work with Dutch metal (imitation gold leaf, a brass alloy of copper and zinc) or silver leaf rather than real gold.

Traditional gesso preparation

Traditional gilding gesso is not the same as acrylic gesso sold in art stores. It is a mixture of calcium sulfate (either plaster of Paris / calcium sulfate hemihydrate, or chalk / calcium carbonate) with rabbit skin glue (RSG) as the binder. The standard recipe: dissolve 10–14 g of rabbit skin glue granules per liter of cold water by soaking overnight, then gently heating to approximately 55°C until fully dissolved (do not boil, which degrades the collagen). Add calcium sulfate (plaster of Paris or fine whiting chalk) gradually to the warm RSG solution until a smooth, cream-like consistency is achieved. The gesso should be thin enough to flow from the brush but thick enough to leave a faint brush mark that levels as it dries. Applied in 10–20 coats with gentle sanding using 220–400 grit sandpaper between groups of coats, building a ground 1–3 mm thick for water gilding.

Gesso hardness after drying is primarily determined by the RSG concentration and molecular weight. Higher RSG concentration produces harder, less absorbent gesso that is more difficult to reactivate for water gilding but more resistant to moisture in humid environments. Lower RSG concentration produces softer, more absorbent gesso that reactivates more easily but may crack in very dry conditions. Documentation should specify RSG brand, RSG concentration (g/L), calcium sulfate type (chalk vs plaster), and application temperature.

Gold leaf karat, alloy composition, and surface colour

Gold leaf karat specifies the gold content by weight: 24 karat = pure gold (but too soft to beat into leaf of reliable thickness, almost never used); 23.75 karat (the standard for fine water gilding in the European tradition, approximately 98.9% gold with the remainder silver and copper) produces a deep, warm yellow gold; 22 karat (91.7% gold, remainder silver and copper) is slightly cooler yellow, commonly used in Byzantine-style icon gilding; 18 karat (75% gold, 25% alloy of copper and silver or copper alone) produces visibly greenish-yellow (higher silver) or pinkish-yellow (higher copper) gold depending on the alloy composition; 12 karat and below produces increasingly less gold-colored results. Dutch metal (imitation gold) is a brass alloy (copper + zinc, approximately 85% copper / 15% zinc) that initially resembles 22 karat gold but tarnishes within weeks without sealing. Document gold leaf by karat, brand, weight per sheet (standard loose gold: approximately 0.1–0.2 mg per 8cm×8cm sheet), and format (loose booklet gold vs patent gold on tissue).

Burnishing mechanics and shell gold

Burnishing works by plastically deforming the gold surface. Gold is an exceptionally ductile metal (elongation at break >40%), so compressive stress from the smooth agate or bloodstone burnisher head does not crack the gold but instead cold-works it: the microscale surface roughness of the laid gold leaf (bumps and wrinkles from the laying process) is plastically flattened to sub-micron smoothness. The smoother the surface, the higher the specular reflectance fraction versus diffuse scatter — the burnished surface appears mirror-bright rather than matte. Burnishing can only be performed on water-gilded surfaces on a hard gesso ground; oil-gilded surfaces cannot be burnished because the yielding size layer absorbs the burnisher pressure rather than transmitting it to the gold. Shell gold is a water-soluble gold paint: gold powder is ground with gum arabic to produce a gold-coloured paint that can be applied with a brush for fine detail work. Traditional preparation uses genuine gold powder at 24 karat; commercial shell gold tubes (Winsor & Newton, Schmincke) use fine gold particles in gum arabic binder. Apply in thin, multiple layers; shell gold dries matte and can be burnished with an agate to partial gloss.

iOS rates and Apple Tax

Gilding and manuscript illumination audiences are highly visual and iOS-dominant: Instagram gilding photography and Reels: 70–80% iOS; YouTube gilding tutorials: 58–70% iOS; TikTok gilding reveal and burnishing content: 72–82% iOS. Beginning November 1, 2026, Apple charges Patreon 30% on iOS-processed subscriptions. At $200/month with 68% iOS: approximately $40.80/month ($489.60/year). At $350/month with 72% iOS: approximately $75.60/month ($907.20/year). At $500/month with 75% iOS: approximately $112.50/month ($1,350/year). Enable the web-only billing toggle in Patreon Creator Settings before October 31, 2026.

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