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Yes, that's the one - I think ""Hentschel of Fleet St"" were just the printers who pioneered the 3-colour process in the UK. But exactly which of the many 3-colour techniques it was I'm not sure. I suppose it could have been an early form of the modern photographic process with filters. When I said above ""From memory only her first one or two books were printed using wood blocks.."" I might have been thinking of Kate Greenaway. A quick look at Bamber Gascoine does not clear up any of this.    "