I use leaded enamels in my own work, and really love the Japanese enamels in particular. There are so many colors to choose from. Here are some of my favorites.
Free Printable:
Enamel Color Chart
Most of these enamels are available here:
Enamel Art Supply
Videos
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To subscribe and/or login to Vimeo: Watch Enameling with Sandra McEwen Online | Vimeo On Demand on Vimeo