The Primatek colors are made with real minerals and don't move very well in water, which makes it a bit difficult to spread the color or build up values. I was using a rough watercolor paper, and a synthetic/mix, which I don't think helped. Next time, I'm going to use my Kolinsky and either a smooth cold press paper or a hot press and see if that helps.
Approximately 9x9 inches. I used a Silver Black Velvet 1 inch flat, 3/4 inch oval and a Da Vinci Cosmotop round, size 4, on Strathmore's Professional 500 Series Gemini Rough