Secret writing

Goldenrod paper turns red when ammonia or other base is added. Parts needed: 1 Goldenrod paper (Must be made with real goldenrod pigment! Certain brands work for this, others don’t.), 1 wax candle, 1 bottle Windex (“Classic”) or other glass cleaner with ammonia.

Provided by Little Shop of Physics/Colorado State University

Runtime: 1:57

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