Hans,
I have,as does Allan,the actual packages of the Caucci/Nastasi dubbing,and while I know what you refering to as "mixes of red blue yellow and white" this is the affect that is the result of mixing primary colors. The end result is different compared to mixing "buggy" colors,but the spectrumized dubbing was intended to match the underside of insects,the part the fish sees.When this stuff gets wet,it looks good as a dry fly body.I have a whole series of eastern mayflys tied with this material,and I can vouch for its effectiveness! Thanks for the replys,CJ