How can I test my extracts for strength?
Mix your extract with sugar in half of the proportion as in your candy recipe and start from there. For instance, if your recipe calls for 1 tsp of vanilla extract and 2 cups of sugar, try 1/16 of a tsp of your extract mixed with 1/4 cup of sugar. Add extract by 1/16 tsp until you get the flavor you want. If you like the flavor after you've added 1/16 of a tsp 3 times, that means you want to use 1.5 tsp in your candy.