My pottery group at Manassas Clay decided to test some new glazes this session. I have been meaning to try some of the recipes in Mastering Cone 6 Glazes (Hesselberth & Roy, Glaze Master Press, 2002), so I chose to try the High Calcium Semimatte Base 1 on page 86. In their book, Hesselberth & Roy present several glaze recipes that they developed, which pass their safety and durability tests. I did not venture too far afield in these tests. I mixed the glazes presented in their book and a few other options where I tweaked the colorants. I did 10 tests in all and now I will narrow down the choices to move on to the next step of testing, which is to mix 1000 gram batches of the glazes and fire them on a pot rather than a test tile. These are the ones I've chosen to move on to the next step (all the test tiles can be viewed on my facebook fan page). I welcome and look forward to feedback with respect to the colors!