Given my desire to only use glazes that are very durable in use, I have tested quite a number of glazes over the years using a professional analytical laboratory and a standard leaching test--the same test specified by the FDA to assure that lead-containing glazes are safe for use with food. I used the same test; however, instead of testing for lead I tested for the colorants or other oxides I thought to be of most concern in each individual glaze. In addition I have collected test results from others and, with their permission, published those results also.
They are divided into 3 categories. Find what you are looking for by clicking on the link below or use the 'Tested Glazes' drop down menu above.