For an added fee you can choose Starphire glass over Clear glass.
Starphire Glass, also known by low iron, Opti-White or Ultra Clear, is a clear transparent glass that is almost tint-free.
Starphire glass feature is best shown in these photos. Notice how this glass does not change the color of the white wall or the tile. As clear glass gets thicker the green hue becomes more noticeable. Sometimes this is not important, but if you want to display true colors that are seen through glass starphire glass is the glass to choose.