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Blast from the past: Suncreens – What does SPF mean? What exactly is sunscreen? Why shouldn’t we make our own?

June 25, 2024June 25, 2014 by SwiftCraftyMonkey

WHAT DOES SPF MEAN? (Originally found here…) What is sun protection factor or SPF? How is it defined? SPF is defined as… the dose of UV radiation required to produce 1 minimal erythema dose (MED) on protected skin after the application of 2 mg/cm2 of produce divided by the UV radiation to produce 1 MED on…

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