Is a beautiful dark purple with lots of silver that is not affected by strong oxidizing / reduction flame. Get lovely blue/purple haze with annealing. The colour intensity increases in larger work with more vivid colours. A popular colour combo is Silver Iris and Magic Mirror.
This rod is of Silver Iris, made by Momka Glass in Washington state USA as a borosilicate glass rod. Each rod will vary between 5-7mm dia and will be 10" (250mm) long.