no, it isn't dirty - it's some kind of spatterware
Today, I'm making Leila's bread recipe and in her photos she's got a small jar nearby with flour in it. I thought I needed something similar to be able to shake flour on the counter and the dough, rather than getting my sticky hands into the canister. And then I suddenly remembered this little thing! I looked inside. Yes, it was flour in there - probably twenty years old. But I cleaned it out and put in some fresh, and what a helpful little article it is!
In my ongoing purgings I had looked at it more than once with evil intent, but now am very glad that its pretty design prevented me from discarding it.
I just love it!