... 550 High-Lead Transparent Frit, suitable for roof tile, ceramic mural or sorts of artistic porcelain ... 560 High-Boron Transparent Frit, suitable for roof tile, ceramic mural or sorts of artistic porcelain ... 565 High-Boron Transparent Frit, suitable for roof tile, ceramic mural or sorts of artistic ... 470 High-Lead Transparent Frit, suitable for roof tile, ceramic mural or sorts of artistic porcelain ...