I have some hand made mugs and the bottom of them are raw(?) undglazed(?) which is pretty bad for them. I still do it, and so far they are still alive

Some of those with printing on them would fade pretty badly.

I have two starwars mugs with all the light sabers from differentcharacters around it, so when the hot water goes in they light up. It’s great.

I only have two because my wife got one and I put it through the dishwasher and ruined it. So I bought two more