Chocolate tempering & decor: couverture, cocoa butter, transfer sheets, and velvet spray

<!-- IMAGE: img-a7choc-01 — Hero inspiration montage: velvet entremet, glossy coloured bonbons, transfer plaque, piped filigree -->

Chocolate is the showpiece medium — but only if it is in temper

Nothing on a patisserie counter reads "professional" faster than chocolate: the suede of a velvet-sprayed entremet, the mirror gloss of a coloured bonbon, a printed plaque, a sweep of piped filigree across a plated dessert. All of it is achievable in a working bakery — and almost all of it stands or falls on one thing you do before you decorate: tempering.

Untempered chocolate is dull, soft, streaky and blooms within hours. Tempered chocolate is glossy, snaps, contracts cleanly out of moulds and holds for months. This article is the decorator's playbook: it takes tempering as the gate, then runs the four finishes that define professional chocolate work — coloured cocoa-butter airbrushing, velvet spray, transfer sheets, and hand garnishes — and maps each to the Domson couverture, cocoa-butter, colour and ready-made-decoration range.

For the full crystallisation science — the six cocoa-butter polymorphs, why Form V is the target, the tabling / seeding / Mycryo / machine methods and the temper test — read the sister article A6-chocolate-tempering-crystallisation. The short version is below.

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1. Tempering, in one screen (the gate to everything else)

Cocoa butter is polymorphic: the same fat can set into six crystal forms, and only Form V (melts ~33.8 °C) gives gloss, snap and contraction. Form VI (~36.3 °C) is the slow grey fat bloom [src-jaocs-polymorphism] [src-nature-tempering]. Tempering is simply steering the whole batch to Form V.

Every method follows the same three-stage curve — melt fully, cool to pre-crystallise, warm to the working temperature — and the working window differs by chocolate type (full table in data.json → tbl-temper-curves):

<!-- IMAGE: img-a7choc-02 — Decorator's temper-curve chart: dark/milk/white melt-cool-work-max bands -->

• Dark: melt 40-50 °C → cool 27 °C → work 31-32 °C (do not exceed 34.5 °C) [src-callebaut-temper-guide]
• Milk: melt 45 °C → cool 27 °C → work 29-30 °C (max 32.5 °C) [src-callebaut-temper-guide]
• White: melt 45 °C → cool 27 °C → work 28-29 °C (max 31.5 °C) [src-callebaut-temper-guide]

These are independently corroborated by a first-party spec sheet: the Zeelandia Arabesque Noir 72 datasheet specifies melt 47 °C, table to 28 °C, reheat to 31 °C, tolerance ±1 °C [ss-zeel-noir72]. Above the max working temperature the Form V seeds melt out and you are out of temper — so for decor work, where every layer must set glossy, hold 0.5-1 °C under the ceiling and always run a temper test before you commit a batch.

Couverture is the right base for decor because its high cocoa-butter content (legally min 31%; typically 32-39%) makes it fluid enough for thin shells, fine piping and clean enrobing [src-codex-87] [src-wiki-couverture]. Compound coatings skip tempering entirely (melt to max 55 °C and use) but give no true snap and a waxier set [ss-satina-dark].

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2. The decorator's materials palette

Before the techniques, know your five materials and whether each needs tempering (data.json → tbl-decor-materials):

<!-- IMAGE: img-a7choc-03 — Materials palette: couverture / cocoa butter / coloured cocoa butter / compound / ready-made, each tagged temper yes/no -->

1. Couverture (callets, drops, discs) — the structural chocolate for moulding, shells, curls, shards, filigree and transfer plaques. Temper required. Catalogue: Callebaut 811 / 823 / W2, Zeelandia Arabesque, Barima.
2. Pure cocoa butter — the fat carrier behind almost every finish: it is the base of velvet spray, the base of coloured cocoa butter, the seed for "silk" tempering, and a thinner for over-thick couverture. Catalogue: Callebaut Cocoa Butter in Callets 100%, Barbara Luijckx Cocoa Butter 1 kg.
3. Coloured cocoa butter (fat-soluble) — cocoa butter carrying fat-soluble pigment; your colour system for chocolate (more in §3).
4. Compound coating — vegetable-fat coating for quick drips and coatings where snap doesn't matter; melt-and-use, no temper [ss-satina-dark].
5. Ready-made chocolate decorations — bought-in fans, pencils, filigree, plaques and pearls; place as supplied, store 12-20 °C [ss-bl-filigree-fan].

<!-- IMAGE: img-a7choc-11 — Callebaut Cocoa Butter in Callets 100% (the carrier for velvet, colour and silk) -->

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3. Colour on chocolate: fat-soluble or nothing

This is the single most expensive beginner mistake, so it comes first: colour applied to chocolate or cocoa butter must be FAT-SOLUBLE (oil-based). A water-, gel- or liquid colour — even a single drop — will seize chocolate into a grainy paste [src-cocoabutter-airbrush] [src-isugarcoatit-cocoabutter]. Water-based colours have their place, but it is on fondant, royal icing and sugarpaste, not couverture (data.json → tbl-colour-systems).

<!-- IMAGE: img-a7choc-04 — Colour decision diagram: fat-soluble cocoa butter on chocolate vs water/sugar colour on fondant/icing, "water seizes chocolate" -->

The catalogue colour range maps cleanly onto this divide, and the spec sheets prove the base:

• Coloured cocoa butter — make it from pure cocoa butter + fat-soluble powder colour or metallic dust. To airbrush: heat to 40-45 °C, then bring down to 31-33 °C so it sets in temper; hold polycarbonate moulds and the room at 18-21 °C; for surface work on finished pieces, apply around 30 °C [src-cocoabutter-airbrush] (single-source reference guidance — validate against your cocoa-butter colour supplier's specific datasheet). Card in data.json → fc-coloured-cocoa-butter.
• Metallic / lustre dust (airbrush) — Food Colour Metallic Dust is mica (E555) + titanium dioxide (E171) + iron oxide (E172) with a recommended dose of ~1 g/kg and a particle d50 of 18-25 µm; dust dry onto tempered chocolate, or suspend in cocoa butter/alcohol to airbrush [ss-fc-metallic-gold].
• Gel colour — sugar/water based (Brilliant Blue E133, thickener E1422); maximum ~21 g/kg for category 05.4 decorations. For fondant and icing — not chocolate [ss-fc-gel].
• Liquid airbrush colour — water based; maximum ~710 g/kg for category 05.4, labelled "dye for food, not intended for direct consumption." Again, sugar surfaces only [ss-fc-airbrush-liquid].

<!-- IMAGE: img-a7choc-14 — Food Colours range: metallic airbrush dust, liquid airbrush dye, gel colours (fat-soluble vs water-based) -->

Glossy coloured moulded chocolates are the showcase use: airbrush coloured cocoa butter into a polished polycarbonate mould, let it set, then cast tempered couverture over it. When the chocolate contracts and releases, the colour is inside the gloss [src-callebaut-glosscolour] [src-cocoabutter-airbrush].

<!-- IMAGE: img-a7choc-15 — Inspiration: glossy multi-coloured moulded bonbons -->

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4. Velvet / flocking spray — the signature entremet finish

The matte, suede-like "velvet" you see on plated mousse cakes is cocoa butter sprayed warm onto a frozen surface. The cold shocks the fine droplets into instant tiny crystals, building a fuzzy, light-scattering texture (data.json → fc-velvet-spray).

<!-- IMAGE: img-a7choc-05 — Velvet-spray workflow: melt 60/40 to 50C, sieve into gun, freeze entremet -18C, spray thin at 45C -->

Spray-gun method (Callebaut) [src-callebaut-velvet] [src-dr-velvet]:

1. Mix 60% chocolate to 40% cocoa butter (some chefs use 1:1); melt together to 50 °C until smooth.
2. Sieve into a pre-warmed spray gun; bring to ~45 °C (use a 3-drop fluidity couverture).
3. Freeze the entremet hard at -18 °C — the thermal shock is the whole point.
4. Spray a thin, even layer in an up-and-down seesaw motion. Too thick a layer peels.
5. Set the piece in the fridge at 8 °C for ~5 minutes; keep the gun warm between passes.

Aerosol velvet cans are the no-gun route — ready-to-use coloured cocoa-butter spray. Apply at a can temperature of 25-35 °C (never above 35 °C) onto the frozen piece [src-silikomart-velvet] [src-kadzama-velvet]. Catalogue: Barbara Luijckx Light Blue / Yellow Velvet Spray, Polmarkus Edible Velvet Spray, plus Glossy Food Spray for a shine (rather than matte) finish.

<!-- IMAGE: img-a7choc-06 — Barbara Luijckx edible velvet spray aerosol cans (ready-to-use) --> <!-- IMAGE: img-a7choc-07 — Close-up of a finished velvet entremet (suede texture) -->

Safety: aerosol sprays are flammable and pressurised — keep below 50 °C, away from flames, and spray in a dedicated booth/extracted area. See §8 and the food-safety notes.

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5. Transfer sheets — printed colour, zero artistry required

Transfer sheets are the highest-impact-for-lowest-skill finish in the book. A transfer sheet is a clear acetate sheet printed (silk-screened) with coloured cocoa butter. Spread tempered chocolate on it; as the chocolate sets, the cocoa-butter design melts into its surface; peel the acetate and the pattern is in the chocolate [src-cocoterra-transfer] [src-edibleprint-transfer] (data.json → fc-transfer-sheet).

<!-- IMAGE: img-a7choc-08 — Transfer-sheet workflow: spread tempered chocolate, set, peel acetate to reveal print -->

Workflow:

1. Lay the sheet printed-side up; spread an even layer of tempered chocolate — don't pierce the acetate.
2. Cut plaques just before full set (or wrap the still-flexible sheet around a chilled entremet for a decorative band).
3. Set at room temperature, or a very brief chill only — over-chilling causes condensation that ruins the print [src-edibleprint-transfer].
4. Peel the acetate when fully solid.

A clean transfer requires correctly tempered chocolate — untempered chocolate gives a dull, smudged print. Uses span bonbon tops, bars, cigarettes/curls, plaques and entremet bands [src-chocolatree-transfer]. Don't want to make them? The catalogue stocks ready-printed transfer decorations — e.g. PAN White Chocolate Transfer Decoration and Chocolate Square Plaque – Baroque Transfer — to place straight onto product.

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6. Hand garnishes — the inspiration tier

With tempered couverture and a marble slab, a few classic garnishes cover most plated and gateau work (data.json → tbl-finish-techniques) [src-pastrymaestra-decor]:

<!-- IMAGE: img-a7choc-10 — Inspiration grid: curls/cigarettes, fans, shards, filigree, marbled plaque -->

• Cigarettes & curls — spread a thin layer of tempered chocolate on marble, let it set to "just firm," and push a scraper/knife across at an angle.
• Fans & ruffles — the same scrape with a thumb anchoring one corner.
• Shards & tuiles — pour/spread tempered chocolate onto acetate, texture or sprinkle, set flat or curved.
• Filigree & run-outs — pipe tempered chocolate from a paper cone in lace patterns onto acetate; peel when set.
• Marbling & splatter — flick or swirl contrasting tempered chocolate or fat-soluble colour for abstract finishes.

All of these need temper for gloss, snap and clean release, and a working room of 18-21 °C. If hand-piping isn't where your team's time is best spent, buy the look in: Barbara Luijckx Rembrandt pencils and Oriental Fan filigree, Dobla fans, curls and pearls are made to professional consistency and store on the shelf.

<!-- IMAGE: img-a7choc-09 — Barbara Luijckx ready-made decorations: Rembrandt pencils + Oriental Fan filigree -->

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7. Metallic & lustre finishing

The final flourish — gold, pearl and metallic highlights:

• Metallic / lustre dust — brush dry onto dry, tempered chocolate, or suspend in alcohol or cocoa butter to airbrush. Food Colour Metallic Dust doses at ~1 g/kg [ss-fc-metallic-gold].
• Lustre / glitter aerosol — PME Edible Lustre Spray and Silver Edible Glitter Spray add a fast all-over sheen to cakes, sugar and chocolate accents.

<!-- IMAGE: img-a7choc-13 — PME Edible Lustre Spray aerosol cans (metallic/pearl finishing) -->

Read the label before you spec these. The PME lustre spray is an extremely flammable aerosol (keep <50 °C, professional use only), it contains allura red E129 so it carries the mandatory warning "may have an adverse effect on activity and attention in children" [src-eu-1333-annexv]; Culpitt also designates this product age-restricted as a voluntary retailer policy (this is not a statutory EU/UK legal requirement — the regulation requires only the warning label) [ss-pme-lustre-spray]. Several of these colour datasheets also list titanium dioxide (E171) — see §9.

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8. Storage & shelf life of finished decor

A beautiful finish that blooms in two days is a customer complaint. After tempering, storage is the second half of the job:

• Finished chocolate / decor: store cool, dry and dark. The bloom-prevention ideal is ~15-20 °C and below 55% RH; supplier datasheets validate up to a maximum of 70% RH as the outer limit [ss-barima-dark72] [ss-bl-filigree-fan]. Wrap against moisture and odours; avoid fridge shock (condensation → sugar bloom).
• Ready-made decorations (filigree, pencils): 12-20 °C, max 70% RH, away from sunlight; shelf lives are SKU-specific — e.g. 24 months for the Oriental Fan filigree but 12 months for the milk-containing Rembrandt pencils [ss-bl-filigree-fan] [ss-bl-pencils-rembrandt].
• Compound coatings: Satina specifies 12-18 °C, RH up to 75%, 12 months [ss-satina-dark].

Deeper bloom mechanism and corrective action: A6-chocolate-bloom-defects.

<!-- IMAGE: img-a7choc-12 — Decor fault grid: peeling velvet, seized chocolate, failed transfer, dull shell, bloom -->

Full troubleshooting in data.json → ft-decor-faults.

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9. Buy the decor for this — catalogue guide

All composition/storage figures from first-party supplier datasheets (sources.json; key numbers in data.json → ks-catalogue-decor).

• Structural couverture (temper it): Callebaut 811 Dark / 823 Milk / W2 White, Zeelandia Arabesque Noir 72, Barima Dark Drops 72%.
• Cocoa butter (the carrier): Callebaut Cocoa Butter in Callets 100%, Barbara Luijckx Cocoa Butter 1 kg — for velvet, coloured cocoa butter and silk.
• Velvet & shine sprays: Barbara Luijckx Light Blue / Yellow Velvet Spray, Polmarkus Edible Velvet Spray, Glossy Food Spray.
• Colour systems: Food Colour Metallic Dust and Powder (fat-compatible for chocolate); Food Colour Gel / Airbrush liquid (fondant & icing only).
• Lustre: PME Edible Lustre Spray (note the warnings above).
• Transfer & ready-made decor: PAN transfer plaques, Barbara Luijckx Oriental Fan filigree & Rembrandt pencils, Dobla fans.
• No-temper coating: Satina Pro Compound Coating (melt to max 55 °C).

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Allergen & food-safety notes (flagged for review)

• FOOD-LAW — titanium dioxide (E171). The PME lustre spray and the Food Colours liquid airbrush and metallic dust datasheets list titanium dioxide (E171). E171 is no longer an authorised food additive in the EU since 7 August 2022 (Commission Regulation (EU) 2022/63) [src-eurlex-2022-63] [src-fsai-e171]. Great Britain retained E171 after Brexit, so the answer depends on the market: obtain current, E171-free datasheets before quoting or selling these into the EU or Northern Ireland. Human review required.
• Colour warning — E129 (allura red). The PME lustre spray must carry "may have an adverse effect on activity and attention in children" under EU/UK colour rules [src-eu-1333-annexv]. The manufacturer (Culpitt) labels this product age-restricted as a voluntary retailer policy — this is not a statutory EU/UK requirement; the applicable regulation mandates only the warning label, not an age gate [ss-pme-lustre-spray]. Reflect both the warning and the professional-use designation in any consumer-facing copy.
• Aerosol hazard. Velvet and lustre aerosols are extremely flammable and pressurised — keep below 50 °C, away from heat/flames, and spray in an extracted booth [ss-pme-lustre-spray].
• Lecithin source. E322 on the Barbara Luijckx decor SKUs (Oriental Fan, Rembrandt pencils) is SUNFLOWER lecithin, not soya — do not auto-declare soya for those. Soya appears only as cross-contamination ("may contain") [ss-bl-filigree-fan] [ss-bl-pencils-rembrandt].
• Milk allergen. Rembrandt pencils contain MILK (declarable); the Oriental Fan filigree carries "may contain MILK and SOYA"; Satina compound carries "may contain PEANUTS, MILK" [ss-bl-pencils-rembrandt] [ss-bl-filigree-fan] [ss-satina-dark].
• Sulphur dioxide. The Food Colour gel carries a declarable sulphur-dioxide note (residue ≤15 mg/kg) from its glucose syrup [ss-fc-gel].
• Trans fat. The Satina compound datasheet (2020) lists partly hydrogenated palm fat; confirm the current post-2021 formulation against the EU industrial trans-fat limit (2 g/100 g of fat) [ss-satina-dark].
• Colour base = chocolate killer. Reiterated: gel/liquid/water-based colours seize chocolate. Use fat-soluble colour / coloured cocoa butter on couverture; reserve water-based colour for sugar surfaces [src-cocoabutter-airbrush].
• Water is the enemy. A drop of water or steam seizes melted chocolate; keep bowls, spatulas, spray guns and frozen surfaces free of free water.

All numeric, dosage, allergen, nutrition and food-safety claims have been independently verified and verdict-applied. Temperatures and storage limits are device- and formulation-dependent — validate against your own equipment, your specific SKU's current datasheet and your local food-law obligations before production or labelling.