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  Home > JCE Print > Journal of Chemical Education > Issues > 2006  > October  >
Chemistry for Everyone
JCE DigiDemos: Tested Demonstrations
A Clock Reaction Sympathetic Ink from Consumer Chemicals
Stephen W. Wright
Pfizer Global Research and Development, Groton, CT 06340

Marsha R. Folger and Matthew A. Rice
Lyme-Old Lyme High School, Old Lyme, CT 06371

checked by:

Michael D. Roadruck
Ottawa Hills High School, Toledo, OH 43606

Kyle B. Yeakel
Department of Chemistry, Kutztown University, Kutztown, PA 19530

Cover
October 2006
Vol. 83 No. 10
p. 1473

Abstract
A sympathetic ink is described that uses a "clock reaction" between hydrogen peroxide and ascorbic acid (Vitamin C) to cause the writing to appear after predictable and controllable periods of time. The experiment is conducted using inexpensive chemicals that are commonly available to the consumer on the retail market.
More Information
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Citation
Wright, Stephen W.; Folger, Marsha R.; Rice, Matthew A. J. Chem. Educ. 2006 83 1473.
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Keywords
Consumer Chemistry; Demonstrations; Descriptive Chemistry; Distance Learning / Self Instruction; Elementary / Middle School Science; General Public; Hands-On Learning / Manipulatives; High School / Introductory Chemistry; Inquiry-Based / Discovery Learning; Oxidation / Reduction; Oxidation State; Public Understanding / Outreach; Rate Law; Vitamins
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History
Created:
Last Updated:
8/23/2006
8/28/2006
 Caution! 
Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations.
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