The previous Mimeo boards used a modern PCB material which has a slight yellow tint. Many people have used different techniques to tint them green where the PCB material is visible.
I was able to work with my PCB manufacturer in the United States to produce a white material which is similar to the original PCB material on the early Apple-1 boards, but is a less translucent. The greenish color that can be seen somtimes at certain angles on the original Apple-1 is actually the green coat underneath. Obviously we cannot reproduce the exact translucency of the original Apple-1, but I think people will be more happy with this new material.
Below is a picture of the PCB material on an original Byte-Shop Apple-1 and a picture of the PCB material on a new unbuilt the new Super Mimeo.