A handy wallet-size card is actually an easy-to-use test for UVA and UVB rays. Expose the card to light, and the sensitive strip on the bottom of the card will change color according to the intensity of UV radiation. Smear cosmetics or sunscreen over the sensitized strip, and assess the radiation- blocking qualities of the product by the reaction of the sensing strip. Reacts in seconds, and responds even in overcast conditions.
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