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Halloween clock reaction

K004/4363

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Credit

RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY

Caption

Halloween clock reaction. The clear solution in the beaker turns orange and then black. A solution of soluble starch, sodium metabisulphite and mercury (II) chloride, is poured into a solution of potassium iodide. As the mercury iodide precipitates the solution turns orange. Then as a starch-iodine complex forms turning the solution black.

Release details

Model release not required. Property release not required.

Downloadable Master

  • Duration: 00:00:11
  • Audio: No
  • Format: Photo JPEG 100% QuickTime movie

Original

  • Capture Format: Sony FS700

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