To say that this glaze is "blue" is a lot like saying, "The sun gives us heat and light and that's all".  If a person takes the time to look, he or she will find specks of gold, blue, red, brown, black, and a color that can only be described as the color of the full moon reflected in a mountain lake somewhere over 9000 feet above sea level.  (That's 3000 meters for all my international friends!)