Get Basf Sunscreen Simulator

The number is determined experimentally indoors by exposing human subjects to a light spectrum meant to mimic noontime sun. The amount of light that induces redness in sunscreen-protected skin, divided by the amount of light that induces redness in unprotected skin is the SPF.

Instructions: Fold the construction paper in half to create two sections. Put a small dab of sunscreen on one side of the paper. Rub it in to the construction paper ensuring to keep the sunscreen on just one side of the paper. Put the paper in direct sunlight for most of the day. Observe any changes to the paper.

For a more sophisticated method, use a UV sensor to investigate the effectiveness of sunscreens by measuring the intensity of UV light. Place the plastic sunscreen sheet over the sensor, rather than the UV beads, and record the sensor's readings.

Because UVB light has a clear and obvious reaction on your skin, it's possible to test a product by directing UVB light onto human skin and seeing when the skin gets an erythemal response. This is a standard ISO (International Organisation for Standardisation) protocol for testing all sunscreens.

Directions Put your containers in the shade. ... Using a different SPF for each box, smear sunscreen on the UV beads and sunprint paper. ... Cover the top of the containers with plastic wrap. Place your containers so that they receive direct rays from the sun. Check your containers every 30 minutes.

The BASF sunscreen simulator is a tool enabling the estimation of various sun protection indexes of your UV filter composition. The principal performance factors of a sunscreen remain the sun protection factor and UVA protection.

Most people used scarves or clothing items to avoid direct sun exposure. Rice, crushed jasmine petals, olive oil, sunflower oil, lupine, pine needles, mud, charcoal, cocoa butter, and burnt almond paste were some of the everyday things that were tried before sunscreen became commercially available.