American Art Pottery Association
The American Art Pottery Association was established in 1983, and seeks to promote an interest, understanding, appreciation, and recognition of American Art Pottery. The association strives to unify and strengthen the voice of collectors and dealers of American Pottery, while fostering a members' Code of Ethics for buying, selling, exhibiting and publishing about American Art Pottery.
Note that the recipe on some bottles (1 tsp in 1 pint cold water) makes a too-thin solution. Better to follow the online recipe from Lineco: 1 rounded tablespoon in a 1/2 cup water and then thin to the consistency you want once it gels.