To explain edge color of a table top or counter it’s important remember that when looking through, for instance, a piece of 3/4” thick glass the “color” of the glass is the result of it’s thickness.
But when looking at the edge of a 40” long x 3/4” rectangular shaped piece the viewer is actually seeing a 40” thick piece of glass. Or to be more precise the available light is see a 40” thick piece
The reason for the color is that ambient light travels the full 40” length, from one edge to the other edge. So if the thickness is 3/4” and has a green tint when looking through it at 3/4” thick, a 40” thick piece could be about 40 times darker, depending of course on the type, amount and direction the available light. Looking at the chart you can see that the edge color of a 12” long piece whether “clear” glass or starfire optically clear glass is about 3 times lighter than the edge color of a 40” long piece.
However, the combining of different types and intensities of light such as natural, incandescent and/or fluorescent or halogen will play a significant roll in the edge color of a table top or counter.
The reason normal clear glass has a green tint is that the silica sand, ( glass is about 70% silica sand ) as the majority component of glass, has a fairly high iron content, where as starfire is made from what’s considered to be a low iron silica. During the manufacturing process certain decolonizing techniques are also used to decrease the influence of the remaining iron. However there is only so far that de-colorizing can be accomplished.
That’s why the edge of starfire glass has “color”. The thicker or visually deeper the glass the greater concentration of iron consequently the deeper the edge color.
starfire low iron glass
common clear glass
note: this chart is an approximation only. Types and the amount of available light will alter the edge color.
How the Onami texture effects the edge and glass color of optically clear low iron glass
There is a difference in edge color between smooth, un-textured starfire glass and Onami Crystal textured starfire glass. Again, with the smooth glass, light can travel unimpeded from one edge to another, but with Onami textured starfire glass, ambient light is refracted and bounced around by the faceted Onami surface causing the light to travel a shorter distance. This reduces the length of the glass in relationship to the density of the remaining impurities after de-colorization and subsequently reduces the color amount of color at the edge.
What causes the edge color of Onami Crystal cold sculpted glass