Recently I bought a tube of gold paint, Winsor & Newton Designers Gouache Gold. I did this little experiment with the gold paint in my sketch book. I used the gold straight up, and also mixed the gold with additions of yellow, white and orange. To my eye, the gold by itself looks more copper than gold, but the hue depends on the light and the angle of the light. What you see is a scanned image of my sketchbook page.