Wheat was made from 1969 to 1983.
Wheat is exactly the same color as Topaz. If you know when it was made then you know what name to give it.
Blog Update-November23, 2013. During my October 2013 visit to Blenko I was told that Topaz and Wheat are NOT the same color formulation. Wheat is just slightly different than Topaz and as a general rule is lighter in color. Having said that, the color Topaz is all over the place as far as intensity of color goes. So while this is a fact, it is not a very useful fact when it comes to determining the color.