Sweat Spot

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In this activity, learners use a chemical reaction to visualize where moisture forms on the body. Learners use the Minor's iodine-starch test, a diagnostic test that doctors use to detect hyperhidrosis (excessive sweating), to identify where moisture is forming. Learners also use this method to test the effectiveness of different antiperspirants.

Quick Guide

Preparation Time:
Under 5 minutes
Learning Time:
10 to 30 minutes
Estimated Materials Cost:
$10 - $20 per group of students
Age Range:
Ages 8 - 18
Resource Types:
Activity, Experiment/Lab Activity
Language:
English

Materials List (per group of students)

  • Iodine tincture (available at pharmacies)
  • Cornstarch
  • Variety of antiperspirants and deodorants
  • Magnifying glass or dissecting microscope
  • Paper and pencils/pens
  • Cotton swabs (optional)

Keywords

Subjects

  • Life Sciences
    • Human Body
      • Muscles and Skin
      • Medicine
  • Physical Sciences
    • Chemistry
      • Chemical Reactions
  • The Nature of Science
    • The Scientific Process
      • Conducting Investigations

Audience

To use this activity, learners need to:

  • see
  • see color
  • touch

Learning styles supported:

  • Involves hands-on or lab activities

Other

This resource is part of:

Access Rights:

  • Free access

By:

  • Yu, Julie

Rights:

  • All rights reserved, Exploratorium, 2007

Funding Sources:

  • National Science Foundation, 0610238
  • National Science Foundation, 0925383