title: The perplexing dilemma of measuring sun protection factors.
abstract: Truth, like knowledge, is surprisingly difficult to define. Indeed, every definition of truth that philosophers have developed falls prey to the question, 'Is it true?' In this essay, we consider what is the true SPF of a sunscreen product and whether it can ever be realizable.
authors.affiliation: Coty Lancaster SAM, International Research & Development Center, Athos Palace, 2, rue de la Lujerneta, MC98000, Monaco.
authors.forename: M
authors.identifier: http://orcid.org/0000-0002-2016-7997
authors.initials: M
authors.lastname: Pissavini
authors.affiliation: Dermatological Sciences, Newcastle University, NE2 4HH, Newcastle Upon Tyne, UK.
authors.forename: B
authors.initials: B
authors.lastname: Diffey
authors.affiliation: Coty Lancaster SAM, International Research & Development Center, Athos Palace, 2, rue de la Lujerneta, MC98000, Monaco.
authors.forename: O
authors.initials: O
authors.lastname: Doucet
mesh_terms: D006801:Humans; D059405:Sun Protection Factor; D013473:Sunscreening Agents; D014466:Ultraviolet Rays
chemical_list: D013473:Sunscreening Agents
keywords: SPF; compliance; cosmetic attributes; sunscreen; testing