Through the analysis of paper chromatography to separate ink from the pen found at the crime scene, learners analyze the different stains and through calculations determine the thief. 

Concepts

paper chromatography, physical properties, crime scenes

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Additional Tags

science

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Instructional Ideas

• Great lab for chemistry or forensic science classes

Classroom Considerations

• Takes 30-45 minutes for all of the dyes to separate, so set up quickly or complete the lab over two days
• May need to model one calculation for classes and then allow pupils to complete
• May be appropriate for some middle school classes based on their abilities

Pros

• Provides lots of information for teachers, from where to purchase chromatography paper to which pens work best
• Engaging lab for all participants due to the set up of a crime scene
• Provides all worksheets, keys, and information needed to complete the activity

Cons

• None

Common Core

RST.9-10.3