Pastry & Confectionery
Pré-Cristallisation (Tempering)
Also: tempering chocolate, pre-crystallization, tablage, mise en température
The controlled process of raising, lowering, and slightly re-raising melted chocolate's temperature to encourage the formation of stable Form V cocoa butter crystals before moulding or enrobing.
/pray-kree-stah-lee-ZAH-syoh/French; pré-cristallisation is the technical term used in francophone confectionery training. The English 'tempering' derives from the Latin temperare (to mix in due proportion), the same root as tempering steel.
Definition
Cocoa butter is polymorphic: it can solidify into six distinct crystal forms (I through VI), each with a different melting point and physical character. Only Form V (also called the β2 form) yields chocolate with the hallmark properties of fine couverture: a high gloss, a clean snap, rapid melt on the tongue, and contraction away from the mould that ensures easy release. Tempering—or pré-cristallisation—is the technique that steers crystallization toward Form V and away from the unstable lower forms that produce dull, soft, or bloom-prone chocolate. The classical three-stage temperature curve for dark couverture runs: (1) melt completely at 45–50 °C to destroy all existing crystal seeds; (2) cool to 27–28 °C so that a mix of Form IV and Form V crystals can nucleate; (3) raise slightly to 31–32 °C to melt out the unstable Form IV, leaving only Form V seeds in suspension. Milk chocolate and white chocolate follow lower curves (work temperature ~29–30 °C and 27–28 °C respectively) because their fat profiles differ. Three principal methods achieve this curve in practice. **Tabling** spreads two-thirds of the melted mass on a marble slab, agitates it with a palette knife and scraper until it thickens to 27 °C, then folds it back into the reserved warm third. **Seeding** (ensemencement) adds finely chopped or pistole-form couverture (typically 20–30 % of total weight) to melted chocolate, allowing the stable crystals already present in the solid chocolate to seed crystallization throughout the batch. **Machine tempering** passes liquid chocolate through a jacketed auger or vibrating table that continuously controls temperature; continuous-flow enrobers in industrial settings use this method. A spot check on temper—spreading a thin smear on a palette knife or marble and observing setting time and surface sheen—is standard before production begins.
In use
“She seeded the melted Valrhona Caraïbe with 25 % finely chopped pistoles, stirred until the temperature held steadily at 31.5 °C, and confirmed the temper with a palette-knife test before filling the polycarbonate moulds.”
See also
- TechniqueEnrobing
- ConceptFat Bloom
- IngredientCocoa Butter
Related terms
References
- 1.The Art of the Chocolatier — Ewald Notter
- 2.Chocolates and Confections — Peter Greweling (CIA)
- 3.On Food and Cooking — Harold McGee
- 4.École du Grand Chocolat Valrhona Technical Guides
Confidence: high
Notes
Why temperature curves differ by chocolate type
Milk and white chocolates contain milk fat, which is itself polymorphic and interferes with cocoa butter crystallization at lower temperatures. Their working temperatures are therefore 1–2 °C lower than dark couverture. Over-tempering (too many seed crystals) produces a thick, lumpy mass that is difficult to work and may set with a dull finish.
Testing temper
A reliable quick test: spread a thin smear on a strip of acetate or a palette knife blade. Well-tempered chocolate at 20 °C ambient should set within 3–5 minutes with an even sheen and no streaks. Slow or uneven setting indicates under-tempering; a grainy, stiff mass before moulding indicates over-tempering.
Form VI and storage bloom
Even correctly tempered Form V chocolate can transform to Form VI over extended storage at fluctuating temperatures, causing fat bloom. Stable storage between 16–18 °C with low humidity is as important as correct tempering for shelf-life quality.