CheMagic Demonstration Video: Fickle Trickle
Fickle Trickle: FICKLE TRICKLE is an old chemical magic trick performed by chemistry teachers over the years. One of us (OSR) first saw the trick performed by his father in the late 1940’s. The trick involves pouring a sulfuric acid solution containing phenolphthalein into a KOH solution. At first there is an excess of base generating the red color of the indicator. As the solution continues to be poured, sulfuric acid becomes the excess reagent, and the red color disappears.