What is the technique for quantifying reflected color in architectural glass?

architectural glass

In the two glass window panes above you can probably notice a difference in the transmission color between the two. The one on the left appears greener while the one on the right appears bluer. There is another difference; the two samples have a difference in reflectance  as well. The sample on the left has a reddish/purple reflectance color whereas the one on the right has a slightly bluish reflectance color.

Is it possible to quantify this difference in reflectance color on a transparent sample such as these architectural glass panels? Yes Continue reading