Effect:
From a clear wine decanter, you pour white wine into a wine glass. When you pour the white wine into a second glass it turns to red wine. The wine stays white when poured into a third glass. When all the wine is poured back into the decanter, it turns to red wine. You now pour red wine into a fourth glass. When poured into a fifth glass the red wine becomes white wine and stays red wine when poured into a sixth glass. Finally all the wine is poured back into the decanter and becomes white wine again.

What You Need:
- a clear wine decanter
- 6 wine glasses (or plastic)
- tannic acid
- ferric chloride
- concentrated sulfuric acid
- water

What You Do Before the Show:
- Make a solution of 1 g tannic acid in 1 L of water and place in the wine decanter
- Number the glasses 1 through 6
- Make a saturated solution of ferric chloride in water. (A small crystal crushed into a few drops of water.)
- Place one drop of this solution into the bottom of glass #2
- Add a drop or two of sulfuric acid to glass #5

What You Do During the Show:
- See Effect.

What is Happening:
- Tannic acid reacts with ferric chloride to produce a blood red coloured complex.
- Under acid conditions, the red complex goes colourless.

Hazards:
- Concentrated sulfuric acid is extremely corrosive.
- Wear protective equipment (acid resistant gloves and lab coat).

Patter:
In these tough times one thing has to do for many. A gracious host can supply white and red wine to his/her guests depending upon their preferences. (Alternatively, for children, you can tell them that it is apple juice and grape juice.)