A red congored solution is poured into a clear acid solution and turns blue as the two liquids meet.

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Photo credit: © Kim Christensen / Alamy / Afripics
License: Royalty Free
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Keywords: acid, blue, change, chemical, chemistry, clear, color, colors, congored, demonstration, education, educative, experiment, glass, hand, indicator, laboratory, liquid, magic, mix, mixed, nature, ph, reaction, red, school, science, scientific, tutorial, university