In this exercise you will determine the effects of water on latent prints.
- Take a drinking glass and handle it, making sure to leave fingerprint impressions on it.
- Immerse the glass in water for several hours.
- After a significant length of time, visually examine the glass and see if you can still see your fingerprints.
- Attempt this in a variety of conditions such as hot water, cold water, soapy water, or salt water.
- Keep notes on your results under each condition.
- Hypothesize reasons for similar and dissimilar results under the varying conditions.