Ivory CrystalA beautiful glaze with white and transparent tones, which grows large white and gold crystals when slow cooled. Ivory Crystal is perfect for elegant forms like vases and decorative bottles. Crystals grow best on smooth surfaces. Crystalline Slow Cool Glazes are a great way to add exciting new details to your work. They are less runny than traditional crystal glazes, removing the need for a drip tray, and can be fired with other, non crystal glazes.