I know just about everyone saw Elsie and Emma's post on decorating a coffee mug with Sharpies. Just to recap, here's what they said:
1. Find a coffee mug and sharpies.
2. Decorate your mug.
3. Bake your mug for 30 minutes at 350.
4. Handwash only!
Well, I tried it. I was slightly stressed one day and needed a creative outlet - something that wasn't my usual creative outlets. So I grabbed some Sharpies and the one white mug I had and got to work. I free handed a bunch of triangles and colored a few of them in with two of my favorite colors (which are probably only my favorites because they were so trendy this summer).
As you can see in the above picture, the Sharpie didn't stick. It came off as soon as I started washing it. So I decided to try it a second time! I got out my Sharpies again and traced over all of the outlines again - I didn't re-do the colors because I didn't think they needed it. I baked it a second time, and it came out looking much better - the colors were much sharper.
The second time I washed it, I accidentally put it in the dishwasher (rather, I asked my dad to put it in the dishwasher, forgetting you're only supposed to handwash it). Fortunately, it didn't wash off! There were a couple smudges in the colors, but the black outline was basically the same as after I baked it the second time. So, I don't know if it would stay that well for everyone, but I definitely recommend drawing/baking your design twice, to help ensure that it sticks.
Update: Basically, the more you wash it, whether it's in the dishwasher or hand washed, the more your design is going to fade. It's probably best if you hand wash the inside and gently rinse the outside.
Let me know if you try it! I'd love to see your designs!