Publication No. 12491
Student Laboratory Kit
Materials Included In Kit
BioFoam® footwear impression box
Calcium sulfate, CaSO4•½H2O, 500 g
Talc, 3MgO•4SiO2•H2O, 50 g
Resealable bags, 1 gallon
Additional Materials Required
(for each lab group)
Brush, flask or similar
The BioFoam contains ≤ 1% formaldehyde. It causes skin and serious eye irritation. It may cause respiratory irritation and cancer. Wear chemical splash goggles, chemical-resistant gloves and a chemical-resistant apron. Remind students to wash their hands thoroughly with soap and water before leaving the laboratory. Please review current Safety Data Sheets for additional safety, handling and disposal information.
Please consult your current Flinn Scientific Catalog/Reference Manual for general guidelines and specific procedures, and review all federal, state and local regulations that may apply, before proceeding. List each chemical and/or product and the proper disposal method. All materials can be disposed of according to Flinn Suggested Disposal Method #26a in the regular trash or saved for future use.
Correlation to Next Generation Science Standards (NGSS)†
Science & Engineering PracticesDeveloping and using models
Obtaining, evaluation, and communicating information
Analyzing and interpreting data
Disciplinary Core IdeasMS-PS1.A: Structure and Properties of Matter
HS-PS1.A: Structure and Properties of Matter
Crosscutting ConceptsCause and effect
Structure and function
MS-PS1-3. Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.
Answers to Prelab Questions
Answers to Questions
Tracks left by footwear are a valuable piece of evidence at crime scenes that is often overlooked. Learn the different ways that tracks from shoes can be used to develop possible suspects in a criminal case.
Footwear impressions are often used to place a suspect at a crime scene. It makes sense that a criminal must enter and exit the crime scene on foot at least for a short distance, making the footwear impression a common denominator in most crime scenes. Criminals have realized it is important to conceal their fingerprints with gloves or their faces with masks. In fact, in the wintertime you might not think anything of a person wearing either of those accessories. However, most people don’t wear shoe covers in their daily lives and doing so would make a person stand out.
In this experiment, the casting of one group member’s shoe will be made using BioFoam and calcium sulfate.
BioFoam® Impression Foam System
Calcium sulfate, CaSO4•½H2O, 425 g
Talc, 3MgO•4SiO2•H2O, < 1 g
Water, distilled or deionized
Brush, beaker or flask type
Plastic bag, resealable, 1-gallon
The BioFoam® contains ≤ 1% formaldehyde. It causes skin and serious eye irritation. It may cause respiratory irritation and cancer. Wear chemical splash goggles, chemical-resistant gloves and a chemical-resistant apron. Wash hands thoroughly with soap and water before leaving the laboratory. Please follow all laboratory safety guidelines.
Making the Impression
Student Worksheet PDF