Ultra clear float glass
Although clear glass does not have substantially high iron content, it is higher than low-iron glass. Due to this higher iron content, clear glass has a greenish tint. This is a result of the natural presence of iron oxide from elements such as sand, or from the cask or container in which the glass was actually melted. The low iron float glass is more transparent than common clear float glass.
http://www.shdyglass.net/clear....-float-glass/ultra-c
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