Once the paint dries, a thin layer of varnish is applied to prevent the paint from flaking and being scratched. Motifs are applied to the glass with paint and are not fired in a kiln. The simpler form of decoration is cold painting. The more permanent of the two, enamel, uses pigments composed of finely ground glass that are fired to fuse the colored glass to the vessel. The ornamentation applied to the glass containers is of two types baked enamel and cold-painted application. The third, of particular importance includes six 17th century wide- mouth blown vessels made from heavy green glass and probably used to store bulk products. The second includes jars such as the set of urn-shaped white or milk glass (milchglas in German) vessels meant to imitate more expensive porcelain ceramics.
The first is composed of round or square-shaped jars with clear glass these free-blown or mold-blown vessels are decorated with Baroque and Rococo motifs including shields, birds, festoons, ribbons, and crowns. Glass drug jars can be divided into three distinct groups.
The Bristol-Myers Squibb European apothecary has more than three-hundred glass containers. Glass drug jars were not considered to have great monetary value and were fragile consequently, such jars for holding oils, tinctures, and syrups once prevalent in German apothecaries of the 18th and 19th centuries are now very rare.
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