Can I draw on a rubber iPhone case with sharpie?

So my friend had an extra iPhone case that she gave to me and it's a plain pink rubber silicon case and if I were to doodle on it with sharpie, would it rub off? I was also thinking about leaving it plain and bringing it to concerts and stuff so I can have people sign this case when I meet famous people and it can be full of signatures. What idea sounds cooler? And would the sharpie rub off?

I'm pretty sure the sharpie would rub off! Get yourself a hard case if you want autographs.

What can I use on my rubber phone case

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