Hi, you say there is purple - but there really isn't honest!

It is a slightly "opaqued" yellow, frothy background, with blue strapping marevered in, then cased.
When you look at it, you see yellow and blue, because the glass does not absorb these wavelengths of light, but reflects them outwards.
What it
is doing is absorbing reddy purple wavelengths. When you look at the glass with light coming through it, you "see" reddy purples, because these are the only wavelenghts that get through - the yellow and blue can't.
Light is not the same as paint! :smg: