I found the article in a magazine and decided I liked the theory enough try it own my own. Obviously, the pics in the mag. gave better indications than my test's, but with a little practice and experience with head porting I think it would work as a good indicator. The main objective is to give indications of wet flow trouble area's. Since the dye is supposed to act the same as fuel in suspension, you looking for the walls and crevices and corners the dye has struck. Then with this information modeled, you can further change port locations and achieve a more homogeneous mixture and less fallout, producing power or mileage.