Ninomiya Enamels can be purchased from Enamel Works Supply in
Seattle, Washington. I believe that they have an 800 number. The
enamels fire very well and there is a terrific range of colors which
make shading a joy, however be prepared to do alot of washing, or
better yet get a set of graded sifters because there a a TON of fines
in these enamels. That aside, I have been using these enamels for
several years and am very happy with the results.