Clear Glass is the glass you see every day in windows, doors and table tops. It is one of the most used commodities in the world.
Clear Glass is made of silica and it allows all spectrums of white light to travel through it. The greenish tint is caused by iron, which is an impurity in the sand used to make the glass. In the glass iron ions absorb in the red (and infra-red) and blue (and ultra-violet) parts of the spectrum, making the glass look green due to the light that is left. You can see this more clearly from the edge because you are looking through a greater thickness of glass.
If we know what the glass will be used for and you can tell us the dimensions, we can recommend the thickness and the edgework of the glass. Our recommendations are: For Glass Protector Tops we almost always use ¼. We love ½ for Glass Table Tops. For windows it depends on the frame but 1/8 and ¼ are very common. 1/8 through ¾ thick glass can be tempered but it easier to tempered that is at least 5/32 and ¾ is so strong it usually doesn't need to be tempered.