Question

Design an experiment that uses the blueprinting process to assess the effectiveness of sunscreen creams. (This question is related to the lab named making oxalate complexes)

Answer 1

1. Conduct this activity on a bright sunny day
2. Place the UV-Detector inside of a clear plastic bag and seal. Make sure that only the plastic is between the sun and the detector
3. Record the color intensity reading shown on the scale. This is the control reading, and will be a baseline to compare the other readings to see if they increase or decrease.
4. Apply a uniform layer of SPF 10 sunscreen over the bag. Make sure the bag is thoroughly covered. Allow the lotion to dry.
5. Place the bag in direct sunlight.
6. Wait 10 minutes to allow the detector beads to change color. Record any color change.
7. Remove the UV-Detector from the bag.
8. Place the detector in area where it will not receive sunlight until the beads turn back to white.
9. Place the UV-Detector inside of another clear plastic bag and seal.
10. Apply a layer of SPF 15 sunscreen over the bag as before.
11. Place the bag in direct sunlight, wait 10 minutes, record the results, and place the detector in an area where sunlight cannot penetrate.
12. Repeat this same procedure using sunscreens of 20, 30, and 50 SPF values.
13. For a more scientifically accurate investigation the entire processed should be repeated twice more.
14. Calculate the average UV reduction (if any) for each sunscreen by adding the values from the three independent results and dividing the sum by three.
15. Record the data in a table similar to the one shown. Use the terms "White," "Light blue," "Medium blue," or "Intense or dark blue" when recording the UV-bead color intensity