Dichrotic ‘Saphiret Glass’ looks brown when reflecting light and purple when light shines through. Fred Daden, the Gaffer in the Royal College of Art Glass Department, gave me a piece of this to blow at the RCA, and I made this group of small vases and a tumbler. It is made by mixing molten gold and glass and was much valued by the Victorians. But its production ended when gold got too costly. And now it is sought after.