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Information is a little sketchy in terms of exactly how, and the amounts of ingredients/chemicals used, but it talks of the old ways of doing ACID ETCHING of glass and the different ways to do it.
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acid action added allowed alum amount appearance applied bath becomes boiling bottom brush carbon cast cause cent clean coat cold colour consists containing cooling copper covered dissolved effect employed fire give hand hard heat iron joint kind lead less lime liquid mass material matter means melted metal method mixed mixture mould necessary obtained operation ordinary oxide pass paste piece pipe plate possible potash powder prepared present produced quantity removed resin rope round salt sand side silver slag soap soda soft solder solution spirits stain stand steam steel sufficient surface taken teeth temperature thick thin tion treated turpentine usually varnish washed welding wire wood zinc