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Glass / Re: Cut lead crystal flower or hyacinth bulb vase for ID please
« Last post by chilternhills on Yesterday at 12:40:15 PM »By the way, I've emailed Patricia and await her reply.
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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