Color Rendering Index (Ra value)
The ability of transmitted daylight through the glazing to portray a variety of colors compared to those seen under daylight without the glazing. Scale is 1 – 100.
For instance, a low Ra value causes colors to appear washed out, while a high Ra causes colors to appear vibrant and natural.
In commercial glass, Ra indicates the effect the specific glass configuration has on the appearance of objects viewed through the glass.