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Illustrated Guide to Home Forensic Science Experiments by Barbara Fritchman Thompson, Robert Bruce Thompson

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Chapter 27. Lab VI-3 Perforation and Tear Analysis

Equipment and Materials

You’ll need the following items to complete this lab session. (The standard kit for this book, available from http://www.thehomescientist.com, includes the items listed in the first group.)

Materials from Kit

  • Goggles

  • Slides, flat

Materials you Provide

  • Gloves

  • Camera with microscope adapter (optional)

  • Microscope

  • Specimens, tape dispensers (see text)

Warning

None of the activities in this lab session present any real hazard. It is still good practice to wear goggles and gloves to prevent contaminating specimens.

Background

Many products are packaged in rolls. Some rolls—paper towels, toilet paper, some plastic bags, and so on—are perforated to deliver portions of fixed length. Other rolls—waxed ...

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