Quote Originally Posted by gustavus View Post
On a side note, most mother boards have layers of copper circuits impregnated inside the the boards, invisible to the beholder of such treasure. I’ve seen as many as 6 layers but when you look at the board you only see the top and bottom layers which are called solder layers.
I've designed 0.062" boards with up to 14 layers of 1/4 ounce copper. In the old days there was a "window" that showed each layer of copper with a number on it through the different layers.
Gus, have you sent out for an assay of your slurry? How do you inform them of what the slurry may contain?