Glazes, mirror glazes & neutral nappages

A glaze is the last thing the customer sees and the first thing that sells the cake. A flawless mirror glaze turns an ordinary mousse cake into a display piece; a thin coat of neutral nappage keeps a fruit tart glossy and stops the strawberries drying out; a brush of bun glaze gives hot cross buns their bakery sheen. All of these are simple in principle — sugar, water, a gelling agent and gloss — and all of them fail for the same boring reason: temperature. This article treats application temperature as the master variable, then works back to the chemistry (gelatin, agar, pectin and glucose) that lets you control it.

See [img-a6gz-01] for a one-page map of the six glaze families and where each one is used.

1. The six glaze families

There is no single "glaze." A working pastry kitchen uses six distinct systems, and the most common beginner mistake is to apply one with the technique of another (see data.json → table-glaze-families):

1. Mirror glaze (glaçage miroir) — a gelatin-and-glucose (or pectin) coating poured at 28-35°C over a frozen entremet for a wet, reflective shine.
2. Neutral / cold gel glaze — an agar- and/or pectin-based ready-to-use gel, brushed or piped cold to add shine and seal moisture on fruit tarts, slices and mousse cakes.
3. Hot apricot / neutral nappage — a pectin glaze (apricot-jam-based or commercial NH-pectin), brushed warm and thin over fruit, or used to seal sponge before icing.
4. Bun / protein glaze — a dextrin or egg(-substitute) wash with no gelling agent, brushed onto a hot product straight from the oven for a sticky sheen.
5. Compound chocolate glaze (pâte à glacer) — a vegetable-fat coating with no cocoa butter, melted and used at 35-40°C with no tempering.
6. Sugar / isomalt glaze and decor — cooked sugar or isomalt for caramel tops and reduced-sweetness showpiece work.

The rest of the article goes through the gelling systems first (because they explain everything else), then each family's technique, then troubleshooting and what to buy.

2. The three gelling systems: gelatin, agar, pectin

Almost every glaze that sets is built on one of three structuring systems. They behave completely differently — most importantly in how their setting and melting temperatures relate (see [img-a6gz-04] and data.json → table-gelling-agents).

2.1 Gelatin

Gelatin is purified animal collagen. It is the workhorse of mirror glazes and set creams because it gives a clear, elastic, "melt-in-the-mouth" gel: it sets below about 15°C and melts near body temperature (~35°C), which is exactly why a gelatin mirror glaze feels clean on the palate. The Bowika pork gelatine datasheet states it dissolves at below 40°C and forms a transparent gel on cooling to 20-37°C [ss-bowika-gelatine].

Bloom strength is the measure of gelling power. Higher Bloom = a firmer, faster set. Leaf gelatin is sold in colour-coded grades (see [img-a6gz-02] and data.json → table-gelatin-grades):

• The catalogue's Kluman Bronze leaf gelatine is 140 Bloom (range 125-155), 13% moisture, pH 5.2, with 86 g protein and 344 kcal per 100 g and a 5-year shelf life [ss-kluman-leaf-gelatine].

  Allergen note — sulphites. The Kluman Bronze spec declares SO2 ≤ 50 mg/kg in the gelatine itself. Above 10 mg/kg, sulphites (sulphur dioxide, E220-E228) are a mandatory declared allergen under EU/UK food-information regulations. At typical glaze dosages the finished-product carry-over is usually negligible, but formulations using large quantities of gelatine must have their sulphite content assessed at finished-product level before labelling can exclude a sulphite declaration [ss-kluman-leaf-gelatine].

• The catalogue's Bowika pork gelatine powder is 180 Bloom (170-190), viscosity 1.8-3.1 mPa·s, pH 4.5-6.0 [ss-bowika-gelatine].
• Across the trade the grades run roughly titanium ~100-125, bronze ~125-155, silver ~160, gold ~200, platinum ~235-250 [src-305][src-306][src-325] (ranges are indicative — Bloom values vary by manufacturer; always confirm against the specific supplier datasheet before formulating by grams).

The single most useful fact about leaf gelatin: sheets are interchangeable by COUNT, not weight. A recipe saying "4 leaves" works with any grade, because the per-sheet weight falls as the Bloom rises (roughly titanium 5.0 g → platinum 1.7 g) so the total gelling power per sheet stays similar [src-306][src-325]. But a recipe in grams must state the grade, or the set will be wrong. For mirror glaze and clean-cut entremets, gold (~200 Bloom) is the usual choice; for soft creams, bronze.

Handling rules (see [img-a6gz-05]):

• Bloom (hydrate) in COLD water. Sheets soak 5-10 minutes until floppy; powder is hydrated into a "mass" at a gelatin:water ratio of roughly 1:4 to 1:6 by weight (a common professional ratio is 1:5; some recipes use as little as 1:4, so treat 1:4 to 1:6 as the practical range) [src-305][src-310][src-319].
• Dissolve in WARM liquid, never boil. Gelatin loses setting power as it approaches 100°C [src-305]. Add it to a base that is warm, not boiling.
• A rough general dosage is 0.6-1% gelatin by weight of total liquid, adjusted to the firmness you want [src-305] (single-source guideline — treat as a starting point).

Food-safety / faith flag — gelatin source. Most confectionery gelatin is porcine (pork skin and bone) [src-321]. Pork gelatin is not halal, not kosher and not vegetarian — a critical point for this platform's Muslim and observant customers. Bovine gelatin from halal-slaughtered cattle and fish gelatin can be halal/kosher; the only fully plant-based route is agar or pectin. The catalogue's Zeelandia Jelly Neutral and Bowika gelatine are pork-based [ss-zeelandia-jelly-neutral][ss-bowika-gelatine].

Food-safety flag — the raw-fruit enzyme trap. Fresh pineapple (bromelain), kiwi (actinidin) and papaya (papain) are well-documented protease sources that digest gelatin's collagen so the gel will not set [src-316][src-317]. The Zeelandia Jelly Neutral datasheet confirms this explicitly: "Do not use with fresh pineapple, kiwi or papaya" [ss-zeelandia-jelly-neutral]. Fresh fig, mango and ginger also contain proteolytic enzymes but their activity is significantly weaker and less consistently documented in professional pastry sources; treat them as a risk to investigate rather than a blanket prohibition [src-317]. The fix for all: use cooked or canned (heat-treated) fruit, or switch to a pectin/agar glaze, which these enzymes do not affect.

2.2 Agar

Agar (agar-agar, E406) is a polysaccharide extracted from red algae [ss-hortimex-agar]. It is the vegetarian, vegan, halal and kosher alternative to gelatin [src-321], and it is what gives several catalogue cold glazes their set — the Zeelandia Paletta Cold neutral glaze lists gelling agent E406 (agar) [ss-zeelandia-paletta-cold] and CSM Merjel uses agar + pectin [ss-csm-merjel].

Agar behaves very differently from gelatin and you cannot swap one for the other 1:1:

• It is insoluble in cold water and must be brought to the boil to hydrate [ss-hortimex-agar].
• It has a large hysteresis: the catalogue's Hortimex agar gels at ~37 ± 5°C but the gel only melts again above ~80°C [ss-hortimex-agar]. That gap is why an agar glaze stays firm in a warm display case where a gelatin gel would slump — but it also means agar gives a firmer, more brittle, less "melting" mouthfeel.
• It is extremely efficient: the threshold gel concentration is ≤0.25% and gel strength is ≥850 g/cm² [ss-hortimex-agar].

2.3 Pectin — HM, LM and NH

Pectin is a plant polysaccharide (from fruit) and the active gelling agent in traditional nappage [src-307]. There are three types a pastry chef needs to tell apart (see data.json → table-gelling-agents):

• HM (high-methoxyl) pectin needs high sugar (roughly >55-65% soluble solids) AND acid (about pH 3.0-3.5) to gel, and it is not thermoreversible — once set, it stays set. This is the classic jam and fruit-glaze system [src-308][src-309].
• LM (low-methoxyl) pectin gels with calcium, needs little sugar, and forms thermostable gels (conventional LM pectin does not re-melt once set; thermoreversibility is a property of the amidated NH form only, not plain LM) [src-308].
• NH pectin is a modified LM pectin: thermoreversible (you can melt it and re-set it again and again) with a low calcium requirement. It is the standard gelling agent for neutral nappage and re-meltable glazes [src-309][src-307]. Always dry-mix pectin with sugar before adding it to liquid, or it clumps [src-322][src-323].

You can see all three pectin behaviours in catalogue glazes: the Dawn Decorgel cold mirror glazes are gelled with amidated pectin E440(ii) alongside sodium alginate, carrageenan and xanthan [ss-dawn-decorgel], while apricot nappages rely on the HM pectin naturally present in the fruit.

3. Glucose syrup: the gloss-and-flow ingredient

Almost every pourable glaze contains glucose syrup, and it is not there for sweetness. Glucose syrup is partially hydrolysed starch, graded by Dextrose Equivalent (DE) — higher DE means more reducing sugars and more sweetness [src-326]. Its jobs in a glaze are:

• Anti-crystallisation — it interrupts sucrose crystal growth, keeping the glaze smooth and glossy instead of grainy [src-326][src-320].
• Flow and finished thickness — adding glucose gives a mirror glaze a better pour and a more even set [src-320].
• In compound coatings, ~5-10% of a 42-50 DE syrup improves viscosity control and reduces fat bloom [src-320].

The catalogue's neutral and chocolate glazes are built on a glucose base: Zeelandia Paletta Cold is glucose-fructose syrup 55% / water 23% / sugar 20% / agar <1% [ss-zeelandia-paletta-cold], and the chocolate version is glucose-fructose 55% / sugar 20% / water 17% / cocoa 6% [ss-zeelandia-paletta-choco]. For from-scratch work, stock Ratos Glucose Syrup (prod_01KJABDDEP3V1VG75Y837Y0PPB). Where you want the gloss and anti-crystallisation of a sugar without the sweetness — for sugar showpieces and low-sweetness decor — isomalt is the tool: it is a hydrogenated sugar (GPM+GPS ≥98%) with very low hygroscopicity [ss-hortimex-isomalt] (covered in depth in A6 sugar work).

Regulatory flag — isomalt and laxative labelling. Isomalt is approximately 97% polyols (sugar alcohols). EU Regulation 1169/2011, Annex V, point 7, requires the statement "excessive consumption may produce laxative effects" on any food containing more than 10 g of polyols per 100 g. Because isomalt IS the polyol, this threshold is reached at any use level above roughly 10 g of isomalt per 100 g of finished product. Finished products that use isomalt as a glaze or decor element must carry this mandatory labelling notice and should be communicated to consumers with IBS who may be sensitive to polyols at lower doses [ss-hortimex-isomalt].

4. Mirror glaze (glaçage miroir): a temperature discipline

The mirror glaze is the headline technique and the one most sensitive to temperature. The defining method is that a warm, fluid glaze is poured over a frozen dessert so it sets on contact into a thin, perfect, reflective film. Get the two temperatures right and it is almost foolproof; get either wrong and it slides off or sets dull. See [img-a6gz-03] for the temperature timeline and data.json → formula-classic-mirror-glaze.

The classic gelatin formula. Cook sugar + glucose + water to about 103°C, pour over white chocolate, sweetened condensed milk and bloomed gelatin, add colour and emulsify with an immersion blender, then strain [src-310][src-319]. The condensed milk and white chocolate give body and opacity; the gelatin sets it; the glucose gives gloss and flow.

The two temperatures that decide success:

• Apply at ~28-35°C (optimum 32-34°C, some recipes start from 28°C) [src-310][src-311][src-319]. Too hot and it melts the surface of the dessert and runs off too thin; too cold and it is too thick to flow into a mirror.
• Pour onto a dessert frozen at -18°C, frozen for 4 hours or more so the surface is hard and smooth [src-319][src-313]. Wipe off any condensation first — a film of moisture is the number-one reason a glaze slides off or sets with dull patches [src-313][src-124].

Technique notes: keep the blender head below the surface while emulsifying so you do not whip in air, and let the glaze rest before pouring so bubbles rise out (the Puratos guide is explicit about both) [src-124][src-311]. Pour in one confident pass; do not go back over it. After glazing, move the cake to ~4°C for at least 2 hours to finish setting cleanly without sweating [src-313][src-319].

Ready-to-use options. If you do not want to cook a glaze, the catalogue carries cold mirror glazes you warm to the working temperature on the pack: Zeelandia Paletta Choco Cold Mirror Glaze (prod_01KJABDWGC05X4MZDYXD8DCVMA, dry matter min 60%, pH 5.0-5.3) [ss-zeelandia-paletta-choco], Dawn Chocolate Mirror Glaze (prod_01KJABEGSBA5SZR6T8NE7X6M2H), Dawn Decorgel cold glazes (designed to be "used cold on frozen bavarois to give a shiny appearance") [ss-dawn-decorgel], and Master Martini Mirall (prod_01KV3KZ9EWDDWFWR75KGHDX9T4).

Allergen flag — Zeelandia Paletta Choco (SOYA). The full ingredient declaration for Zeelandia Paletta Cold Jel Choco includes chocolate pieces (1%) that contain SOYA lecithin (E322). The product's allergen table marks SOYA as a CONTAINS allergen. This is not reflected in the simplified ingredient description in the summary frontmatter. Any finished product, menu description or product page featuring this glaze must declare SOYA in bold per EU Regulation 1169/2011 and UK equivalent legislation. The spec also notes milk as a may-contain cross-contamination risk [ss-zeelandia-paletta-choco].

5. Neutral and cold gel glazes

A neutral glaze is a colourless, near-tasteless gel that adds shine and seals moisture — the everyday finish for fruit tarts, sliced gateaux and individual mousse cakes [src-307]. Commercial neutral glazes are agar- and/or pectin-based and come ready to use:

• Zeelandia Paletta Cold (prod_01KJABDKPQY93C9S9SVEQQ4Z69) — agar-set, dry matter min 60%, pH 3.4-3.9, described on its own datasheet as a "gel with a high-gloss mirror" [ss-zeelandia-paletta-cold].

• CSM Merjel CPJ Neutral (prod_01KJABES9FRJEQTW0F8BYF88B5) — a cold-process clear jelly, "ready to use," for covering fruit in tarts, layering and masking; loosen with up to 100 g cold water per kg if you need more flow [ss-csm-merjel].

  Allergen flag — sulphites (CSM Merjel). The CSM Merjel spec declares SO2 at 41 PPM in the finished glaze — well above the 10 mg/kg EU/UK mandatory-allergen threshold. Any finished product containing Merjel must carry a sulphites allergen declaration. The spec also flags potential cross-contamination with eggs, milk/lactose and soya on the production line [ss-csm-merjel].

• Also Zeelandia Neutral Gel Glaze (prod_01KJABE91MW7E9XJDBH5G1PRJD), Martin Braun Claro Gel (prod_01KJABE91NP752K2R4RDH91YKQ), Komplet Kiddy Gel (prod_01KJABDKPP8DQRPSSZAGNEVWP9) and Bakels Instant Superglaze Neutral (prod_01KJABEBJGF7RFK9SZAF6XK9BX).

To make a neutral glaze in-house, the modern method uses NH pectin (thermoreversible, so you re-melt and reuse it) — see data.json → formula-neutral-nappage-nh-pectin: dry-blend the pectin with sugar, heat with water and glucose, boil ~2 minutes, then brush warm [src-322][src-323].

6. Hot apricot and neutral nappage

The traditional nappage is the brush glaze that makes fruit tarts shine and keeps cut fruit from drying and browning [src-307]. The low-tech version is apricot glaze: heat apricot jam with a little water until fluid (heat, do not hard-boil), strain, and brush a thin warm coat over the fruit or over sponge before icing [src-318] (see data.json → formula-apricot-nappage). Apply it thin and by dabbing — too thick and it looks jelly-like when set [src-307].

Commercial nappages do the same job more consistently and often use NH pectin for re-meltability [src-307]. The catalogue carries Zeelandia Paletta Apricot Glaze (prod_01KJABE7SNNK2JE8AZB3QM02H4), Dawn Belnap Apricot Fruit Glaze (prod_01KJABE6KX1SJF6X76C6AQK7MJ) and a hot neutral type, Zeelandia Neutral Paste/Glaze (Hot) (prod_01KJABDZGZ5TQE4B162RT5PB6P). A glazed fruit tart is shown in [img-a6gz-07].

7. Bun and protein glazes

Not every shine needs a gelling agent. A bun glaze is a starch-derived (dextrin) or egg-based wash brushed onto a hot baked product to give the sticky, lacquered sheen of a hot cross bun or a fruited loaf. The catalogue's Bakels Bun Glaze RTU (prod_01KJABEAYBX2RF76P5V3NNERBN) is simply water 80-85% + potato dextrin 15-20% with a little preservative and guar gum, contains 0 g sugar, is vegan-suitable, and must be applied to baked goods immediately after baking [ss-bakels-bunglaze] (see [img-a6gz-10]). For an egg-wash sheen without the egg (and its allergen and shelf-life issues), the catalogue also lists Polmarkus BackGlanz egg-wash substitute.

8. Compound chocolate glaze (pâte à glacer)

A compound chocolate glaze (pâte à glacer) is a fast way to put a glossy chocolate coat on eclairs, slices and petits fours without tempering. The trick is that it contains no cocoa butter — it is built on vegetable fats (palm, palm-kernel or coconut) — so there is no polymorphic crystallisation to manage [src-314]. You simply melt it (~40-45°C) and use it at ~35-40°C [src-315]. Treat it like couverture (over-cool or "temper" it) and you get the streaky, dull result that compound coatings are meant to avoid (see the fault table).

The catalogue's Helios Premium Dark Chocolate Glaze (prod_01KJABE6KX71XP2KR27H6T58GD) is exactly this: non-hydrogenated palm fat + 12.5% fat-reduced cocoa, with emulsifiers E322 (lecithin) and E492 (sorbitan tristearate); 38 g fat (of which 36 g saturated) and 566 kcal per 100 g; supplied in solid strips; 12-month shelf life [ss-helios-dark-glaze]. The Helios White Glaze (prod_01KJABE6KXY48PAMCN8V909D5Z) is the white equivalent (palm fat + whey/lactose) at 573 kcal/100 g [ss-helios-white-glaze].

Allergen flag. Both Helios compound glazes may contain milk, nuts and peanuts, and the white glaze contains milk [ss-helios-dark-glaze][ss-helios-white-glaze]. Carry these declarations to the finished-product label. (For real-couverture glazing, where tempering and Form V crystallisation matter, see A6 chocolate tempering and A6 couverture vs compound chocolate.)

9. Troubleshooting

The failures below are the ones that actually happen on the bench; almost all of them trace back to temperature or moisture (full matrix in data.json → faults-glazes; see [img-a6gz-11]).

• Glaze slides off → substrate not fully frozen, condensation on the surface, or glaze too warm. Glaze straight from the freezer (-18°C, ≥4 h), wipe off condensation, and bring the glaze to ~28-35°C [src-319][src-324][src-313].
• Dull / cloudy finish → moisture on the surface or air still in the glaze. Control surface humidity, rest the glaze after blending, set the glazed cake at ~4°C [src-313][src-124].
• Air bubbles → blender drew in air. Keep the head below the surface, rest, strain, pour low [src-311][src-124].
• Too thick to flow → working temperature too low, or dilution too low. Warm gently; for cold gels add water (up to 100 g per kg for Merjel) [ss-csm-merjel][src-310].
• Rubbery layer → too much gelatin, or the coat dried out in the fridge. Reduce gelatin; protect from moisture loss [src-313][src-324].
• Gelatin jelly never sets → raw pineapple/kiwi/papaya/fig/mango/ginger enzymes. Use cooked/canned fruit, or switch to agar/pectin [ss-zeelandia-jelly-neutral][src-316][src-317].
• Compound glaze streaky/grey → it was treated like couverture. Do not temper pâte à glacer; melt to ~40-45°C, use at ~35-40°C [src-314][src-315].

10. What to buy from the Domson catalogue

• Gelling agents: Kluman Bronze Leaf Gelatine (prod_01KJABEA8GP0S9B8371XY2R2PB) and Edible Gelatine Powder (prod_01KJABEE7ZEXPHZWDX3Y6XM7YG); Bowika Pork Gelatine 180 Bloom (prod_01KJABDFZW6E9CAF5NJNQDKR8P); Hortimex Agar MN5 (prod_01KJABDKPP9K3JKZ58GP094BWC) for the vegan/halal/kosher route.
• Glucose & sugars: Ratos Glucose Syrup (prod_01KJABDDEP3V1VG75Y837Y0PPB); Hortimex Isomalt ST-PF (prod_01KJABDCKQCHX5CKM8CK1ZWKDZ) for low-sweetness/showpiece work.
• Ready-to-use mirror glazes: Zeelandia Paletta Choco Cold Mirror (prod_01KJABDWGC05X4MZDYXD8DCVMA); Dawn Chocolate Mirror Glaze (prod_01KJABEGSBA5SZR6T8NE7X6M2H); Master Martini Mirall (prod_01KV3KZ9EWDDWFWR75KGHDX9T4); Dawn Decorgel Plus White Glaze (prod_01KJABEDKR1F52NVGF9V89Z9RG).
• Neutral / cold glazes: Zeelandia Paletta Cold (prod_01KJABDKPQY93C9S9SVEQQ4Z69); CSM Merjel (prod_01KJABES9FRJEQTW0F8BYF88B5); Zeelandia Neutral Gel Glaze (prod_01KJABE91MW7E9XJDBH5G1PRJD); Martin Braun Claro Gel (prod_01KJABE91NP752K2R4RDH91YKQ); Komplet Kiddy Gel (prod_01KJABDKPP8DQRPSSZAGNEVWP9); Bakels Instant Superglaze (prod_01KJABEBJGF7RFK9SZAF6XK9BX).
• Apricot / hot nappage: Zeelandia Paletta Apricot (prod_01KJABE7SNNK2JE8AZB3QM02H4); Dawn Belnap Apricot (prod_01KJABE6KX1SJF6X76C6AQK7MJ); Zeelandia Neutral Paste (Hot) (prod_01KJABDZGZ5TQE4B162RT5PB6P).
• Bun glaze: Bakels Bun Glaze RTU (prod_01KJABEAYBX2RF76P5V3NNERBN).
• Compound chocolate glaze: Helios Premium Dark Chocolate Glaze (prod_01KJABE6KX71XP2KR27H6T58GD); Helios White Glaze (prod_01KJABE6KXY48PAMCN8V909D5Z).
• Set jelly mix: Zeelandia Jelly Neutral (prod_01KJABDE5YCPEZPG7D2JJXS4ET) — note: pork-gelatin based, and not for use with fresh pineapple/kiwi/papaya [ss-zeelandia-jelly-neutral].

Supplier product photography to assemble for this article is catalogued in images.json ([img-a6gz-08], [img-a6gz-09]); the operator holds supplier-photo permission and will make final selections.