yes that's the one i think hentschel of fleet st were just the printers who pioneered the colour process in the uk but exactly which of the many 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