Pebeo vitrea 160 frosted markers pack of 9create stunning frosted effects with these quality glass markers for use on glassware and crystal as well as ceramics metal enamel and terracotta leave to dry for 24 hours to fix the colour place in a cold oven take the temperature up to 160c then bake for 35 mins colours are then washable and rub resistantset of nine frosted colours neutral anise mint azure blue gitane blue purple pink orange and lemon