Description
Precise thermal cycling of chocolate to stabilize cocoa butter crystals in Form V (β2) configuration for glossy finish and sharp snap.
Technical
Cocoa butter contains six polymorphic forms (I-VI). Tempering promotes Form V crystals (18-20μm) by melting all crystals >50°C, nucleating stable β2 crystals at 27°C, then maintaining 31°C to melt unstable forms (IV, III). The β2 crystals form dense 3D networks with 15-20% crystalline content.
Culinary Significance
Proper tempering ensures chocolate has contractile properties for molding, prevents fat bloom (white streaks), and provides the signature audible snap. Untempered chocolate sets soft and dull.
Science
Primary Reaction
Crystallization of cocoa butter
Parameters
Temperature
31°C optimal
45°C to 32°C range
Dark chocolate: 31°C, Milk: 30°C, White: 29°C
Time
30 minutes
20 minutes – 60 minutes
Nucleation phase requires 5 uninterrupted minutes at 27°C
Equipment
