content: Many of these glazes are from other sources , same for clay bodies , but have been altered slightly to be presented anew. No real emphasis on glaze toxicity . Fritting Barium and Lead does not guarantee safety in the finished glazes . It's a case of user be aware . No guidelines for glaze usuage on functional wares or decorative . Is the glaze able stand table use - who knows ? Another in the long line of Artistic Glaze books , Ho Humm.