Muffle glass was popular in Europe back in the 1800's. In recent times there has been a demand for restoration of old windows and the re-manufacturing of this beautiful glass. We distribut and stock 90 percent of the colores that are being reproduced. Special note: The Cranberry Pink is very rare the manufacture only makes a limited amount of this gold content color and distributors are unable to order more until the next batch which can take a year.