Using Sunscreen (Brilliant Biology Experiments)

You will need:

1. Clear plastic sheet (cut into 4 equal squares)
2. Scissors
3. Ruler
4. Permanent marker
5. Sunscreen lotions (with 3 different SPFs—0, 8, 15, 45)
6. Plain tray
7. Photo reactive paper or thermal fax paper

Is a sunscreen of a higher SPF (Sun Protection Formula) actually better at protecting the skin than a sunscreen with a lower SPF?

INSTRUCTIONS

1. Take 4 equal squares of the plastic sheet. Label it clearly based on sunscreen lotions you have (e.g. SPF 0, SPF 8, SPF 15 and SPF 45).
2. Take a small amount of the lotion and rub it over the corresponding plastic sheet.
3. Leave the lotion covered side facing up and ready to use over the photo reactive paper.
4. In a darkened room ask an adult to help you cut the photo reactive paper into 4 parts.
5. Place the paper on the tray, and quickly cover it with the lotion-covered plastic sheet.
6. Place the entire tray along with the 4 squares outside in direct sunlight, for 5 minutes.
7. In case the photo reactive paper demands you to wash it by submerging it in water once, ask an adult to help you.
8. Once they are rinsed, place the photo reactive paper under a label with the appropriate SPF written under it.

RESULT

A higher SPF-content proves more useful in the areas of high altitude or where there is direct strong sunlight. Based on where you stay and how much outdoor activity you undertake, you should use an appropriate sunscreen.