The New Perfume Handbook by Nigel Groom. A true textbook – and priced accordingly; it’s out of print and sniffing out a copy on the web might is a real investment, and only (we’d say) for the really serious perfume obsessive. (Though of course there’s always the library…) But if you do get your hands on one, it’s especially useful for info about ingredients (natural and synthetic), ‘perfumespeak’ terminology and fragrance brands. (Though of course we do cover a lot of that territory on this very site.)
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At Amazon