Ive been looking into this Sharpie+mug+350 degrees craft and it looks as though many people have been experiencing fading or the colors coming off altogether. Therefore, I would like to share this bloggers page. She explains to the tee how she cooked her mug at 425 for 30 minutes and then left the mug to cool in the oven. The results: a permanent cup at last! Check this out!
Dixie cups, scrapbook paper, Christmas lights - light up the loft
Make sure to clean your porcelain well before starting. Then you simply paint or draw on your design. When you are done, let them dry for a good 24 hours, then you heat set your designs by "cooking" them in a regular oven. 150 degrees celsius (300 degrees Fahrenheit ) for 35 minutes. After you have done that you can safely use it with food, use it in the microwave and dishwasher.