ā¦and is the work of Johann Schaper (died 1670), who had been a Nürnberg glass painter, J.L. Faber, and others. Polychrome enamel decoration was developed by another glass painter, Abraham Helmhack (1654ā1724), who mastered the technique as early as 1690, many years before it was adopted by the factories. Theā¦
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