How to draw permanently on a mug?

MH
by MH
My employer, in an effort to save money on paper cups (and save trees!), gave us all white mugs (standard, everyday porcelain mugs) imprinted with the company logo a couple of months ago. That's great, except that all the mugs look exactly the same. So I tried writing on mine with a permanent marker, and it lasted a while, but with repeated washings the writing has faded a bit, and eventually I'm sure will fade completely. What can I use to write on my mug so it lasts?

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