Baz,
If the Paper is embossed, then there is a strong possibility that an emulsion paint will not be happy, to both secure a lasting result and allow the emulsion to bond. Paint the paper with a thinned oil based undercoat prior to the emulsion.
Dec
Indeed it does Emily, yet as you said some, and I don't know which do I. So perhaps it would be wise to offer a sense of caution.
Dec
That was a find!
I may have to defer to "TheDec's" superior familiairity with 20 year old embossed anaglyptas, but I am still struggling to believe that they will need oil painting before the application of emulsion paint.
Unless their surface is coated with some sort of plastic/polymer, they should be fine to paint with either matt or sillk emulsion.