heath tile glaze qualities 2007 catalog code m-1 ... light stone grey eucalyptus dark slate blue new chamois pumice sand rutile olive #1 ... yellowstone ogawa green stone gold sky blue blue lake meadow green olive #3 ... greystone slate #1 dark beach red sienna corten teco ... green museum black slate #2 bay blue faded blue forest matte brown turquoise ... hematite lichen modern blue palette neutral neutral neutral neutral ... in the installation acid resistance tile glazes without a are not acid ... into repeat/prolonged contact with the tile acids may cause discoloration crazing ... affect the structural integrity of the tile though may lead to discoloration ... the natural beauty of the handcrafted tile no guarantee is made against crazing ... crackle tile when used in bathrooms tiles must be sealed to prevent mildew ...