The art historian Gustav E. Pazaurek devoted several pages to Goldberg in his 1901 publication on modern glass. He presents him as a self-made man who significantly enriched the offer of luxury glass from the Nový Bor region, both technologically and artistically. The new techniques were most utilized in painted and engraved glass.
From the specific techniques, he highlights a novelty called Tula – fired silver on a polished, partially cut surface. In addition to the aforementioned high enamelling, Karl Goldberg’s products were characterized by red glaze on the outside and yellow iridisation on the inside; coloured glass decorated with fired silver or gold using electroplating; translucent glass with partially engraved or etched layers, cut in combination with etching on coloured glass; various forms of engraving; and embellishment with fused nuggets. At the turn of the 20th century, very popular glass pieces imitating precious stones, such as lapis lazuli, also appear in the product range.
In 1888 and 1898, Goldberg patented new methods of glass decoration, which are in our research interest for the near future.
It must be said that the reproduction of the original refining and decorative techniques nowadays is often very complicated, or even impossible. The main reasons include altered or completely lost recipes for the materials used. Frequently, current environmental standards do not allow manufacturers to use the original materials due to occupational safety and environmental protection. Yet, for these reasons, too, some techniques and products are exclusive, and have become a legacy for future generations that needs to be upheld.