What You Need to Know
The shock forces a high nucleation rate while suppressing crystal growth, stabilising the thermodynamically favoured Type I β‑V crystals of cocoa butter and fine sucrose lattices. In ice‑cream mixes the rapid freeze creates sub‑50 µm ice crystals, preventing ice‑crystal coalescence. The controlled temperature window (e.g., 31 °C → 27 °C for chocolate) locks in the desired polymorph and prevents formation of larger, less stable crystals.
The Science
Primary Reaction
Rapid nucleation and suppression of crystal growth via a steep temperature gradient