Amongst seven Margot Thomson-designed, Caithness, lampwork weights in my collection five have hand-engraved markings to the base or basal-rim. Two have the more common acid-etched Caithness markings. These weights also contain dark blue grounds whilst the grounds in the engraved weights are relatively transparent; either colourless or with a relatively light colour.
I'm speculating that engraving has been used when an acid-etched marking might otherwise be visible when viewing the designs from the front/top. Is this correct? Or perhaps there's another
convention that has been followed? .. Or perhaps there's none?!
Peter