Pour corn syrup and sugar into a buttered 3-quart saucepan set over medium-high heat.
Cook until a candy thermometer reaches 280 degrees Fahrenheit.
Meanwhile, in another saucepan bring water, pectin, and baking soda to a boil, stirring constantly.
Once the sugar syrup reaches 280 degrees, pour in the pectin syrup. Stir constantly for one minute then remove it from the heat.
Stir in the flavoring.
Pour the gumdrop mixture into your brain molds, filling them 3/4 full.
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