It always seemed to me that "stained glass" was a strange name for colored glass. Stain seems to describe a soiling or application of dye, neither of which is an accurate description of stained glass. The color in glass is not the result of pigment, rather the color comes from mixing metals with the molten material. For example the deep wine color of most red stained glass is from the addition of gold to the mix, not an inexpensive dye.
In this photo the glass is pale, not like most stained glass found in many church windows, but is is attractive non the less.