Done on Arches Aquarelle Hot Press, 140# paper, with gouache and ink. The extensive gold work was using Winsor & Newton Designers Gouache Tube, Gold. I can not possibly recommend the tube gold strongly enough. I had experience with bottles of pre-mixed gold, from the same company. They worked great, when I opened the jar. and then 6 months down the road, they had dried out to un-usability. The tube gold also allowed me to mix in a hint of other colors, to make the interlace stand out from each other, without impairing the shine of the gold.