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Glass / Re: Purple Bagley Tulip Lamp
« Last post by Lustrousstone on Today at 10:46:22 AM »Amethyst was a Bagley colour apparently but a scarce one. There are two examples in the Bagley book
Hajdamach on Northwood’s work on pages 184/185 says: “The effects produced by Northwood’s [acid etching] machines consisted only of outlines. If the areas inside the figures were to be shaded the glass was passed to the engraving shop. Broad copper wheels were used to matt [or frost] the surface...” [my square brackets]. He used this mechanical frosting over large areas as illustrated by a jug in Plate 166. He goes on to say Northwood then develops an acid etch frosting treatment used in conjunction with resists, but the grinding method was used by them until c1862.
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