Angela — There is one type of glass from this era which puzzles me, as I don't know how it was made, and it could just be a candidate for Sowerby's
Slag Glass. It is popularly known today as
Cottage Glass, and is a multicoloured net over an opaque white opal background, showing through as ovals, finally cased in clear crystal. Newby (No. 141) attributes it to "Stourbridge", whatever that means. If you haven't a copy of Newby, there is a fascinating example live on eBay
here, which looks as though it has been machine threaded with clear crystal and then blown into a shape mould! I know it's a remote possibility, but I think you have to keep an open mind on this.
And, finally, there is one style of Sowerby colouring for which we don't seem to know the name. That is the splashed version of marbled glass, apparently only found as mould-blown fancies, as, presumably, the white surface colour was marvered in. See Newby No. 157 and Cottle p56. That inkwell on the same page is rather mysterious.
Bernard C.
