I feel as though the silver was used as base, masked then painted the color green. Peel away the mask, scratch the edges of the paint to get the sharpe edged scratches...then I topically added the yellow. The only reason why I went topically with the yellow was because the edges were mostly rounded out and I saw no reason to use the scratch method to get the sharper edged scratches (that and I am cheap as hell when it comes to paint