The Klein Iser Works were left in the capable hands of his kinsman Karl Kittel. Kittel retired in 1853 and was replaced by Johann Bengler, a bookkeeper from Christiansthal, who headed up the works for nearly forty years. Begler invented a number of coloured glass types including jet black, lily yellow, antimony ruby, marble-like variations, and the Venetian aventurine. He was awarded the Empire's Golden Service Cross as a tribute to his glassmaking skills. In the early 1850s two long ‘pulling rooms’ were added to the glassworks. These were used to stretch glass to make tubes for the six faceted cut and polished seed beads then in demand.