Sour taste is the body's way of identifying acid, so if your candy tastes sour, it contains acid.


To test for acid yourself, try this:

What you need:

• Fruit-flavored or sour candy, such as LemonHeads, Nerds, Skittles, StarBurst, or Sweet Tarts
  
• Baking soda

What to do:

1. Dissolve the candy in a half-cup of water.*
2. Sprinkle a spoonful of baking soda into water.
3. Watch for bubbles.  If it bubbles, the candy is acidic.

What's happening:
 When you dissolve acidic candy in water and add baking soda, the reaction produces carbon dioxide gas.  This is what makes the bubbles.

*If the candy is taking too long to dissolve, try crushing it first.  You can also get pretty fast results using Pixy Stix or candy covered by sour powder.