Using uranium in glassmaking as a way to create green and yellow glass or in other colors, like white, makes the glass look different. With about 10% of sunlight being UV light, this will definetly affect the look of the colors than glass colored without the use of darkness and a modern UV light. it is difficult to photograph it without considerable setup, but we have a vintage green canister set and vintage green measuring cups. The measuring cups are all UV reactive and they have a definite warmer glowing green yellow color than the traditionally-colored green glass, side by side. Uranium has been widely used to color glass since the mid 1800s and was very popular for many decades!! The casually-named Vaseline Glass was very popular and is varying styles of a yellow green (photo borrowed, item not mine). It is also used to color opaque glass is seen in the second photo, also not mine, below. And as mentioned above, when that glass is used as cullet for marbles, the UV quality is passed on. Uranium is still in use today to color glass.