02/19/2015 12:02 PM EST
Goldenrod paper turns red when ammonia or other base is added. Parts neede: 1 goldenrod paper (must be made with real goldenrod pigment, certain brands work for this, others don't); 1 wax candle; 1 bottle of Windex (classic) or any other glass cleaner with ammonia.
This is an NSF Multimedia Gallery item.
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