Tempering Chocolates and Crystallization
March 14th, 2010When you want to make chocolate candy, you should temper your chocolate especially if you’re utilizing pure, better grade chocolate. By tempering alone, you can turn chocolate into firm, velvety, and lustrous confections. If you don’t temper, the chocolate candies will be unattractive, blotchy, gritty and crumbly due to blooming, a chalky, streaky sheen on the surface of chocolates.
Cocoa butter, the ingredient from which you make your chocolates, contains fatty acids which come together into six dissimilar types of crystals, a process called polymorphous crystallization. Tempering alone prevents this from happening. Because all chocolates contain cocoa butter, tempering is absolutely necessary.
The molecules in the cocoa butter bond jointly to form crystals, the type and quantity of which depend on the temperature maintained throughout tempering.
The melting and freezing temperatures of these crystals are also unique. Near the freezing point, these crystals transform the liquid molecules into solid. It’s on the concentration and regularity in size of the crystals that the stability of the created solid depends. Tempering alone makes these crystals stable and the crystals maintain stability at room temperatures. Only at their melting point of 96F do the crystsals in chocolate totally disappear, hence the need to temper in order to create the crystals again.
It’s also imperative that you keep precise temperatures and for this a Mercury-Gauge Chocolate Thermometer that has the capacity to read even low temperatures like 80F would be most helpful.
Tempering is done in three stages: heating, cooling and re-heating. By not maintaining accurate temperatures, you give scope for the other crystals to dominate proliferation and curtail success in the tempering process by not allowing type V crystals to form. Without type V crystals, you cannot create shiny, smooth, crisp, firm and stable chocolates. All these qualities are retained until the chocolate reaches near-body temperatures. Beyond that, temper will be lost and re-tempering becomes necessary.
After melting, the chocolate is cooled by working upon it on a heat-absorbing surface such as a marble slab and the result are type IV and type V crystals. These two crystals become the “seeds” that guide the bonding process of the other crystals. If you heat the chocolate again, type IV crystals are done away with and type V crystals remain. The temperatures you must maintain in these steps vary from one variety of chocolate to another.
Chocolates cannot be subjected to dipping, molding and sculpting if their temperatures have gone below the correct chocolate temperature zones because then they would’ve been ruined. You can extend the tempered state of chocolates by setting your chocolate-filled bowl on a bain-marie or a hot pad.
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