Edited October 18/14 - the link for DYIoplolis doesn't seem to exist anymore.
1. Cheap ceramic mug - yep.
2. Clean well - yep.
3. Wipe area with rubbing alcohol - yep.
4. Write or draw design and let dry for 24 hours - yep.
5. Bake for 425 deg for 30 mins -yep.
As a test, I used a red regular Sharpie and used oil paint Sharpies for the black and purple. I wanted to see how they compared.
|Just painted, before baking.|
This is the mug after cooling in the oven and washed by hand with a dishcloth and dish soap. Scrubing wasn't vigorous - just washed as a normal coffee mug would be. The black and purple paint markers held up well to the baking. The red faded but seems to be ok. Next test will be the dishwasher.