Machine washed my cake pans I got two circular cake pans for Christmas, and finally put them to use for home-made yellow cake layers. Feeling lazy, I tossed them into the dish washer afterwards instead of hand-washing, and realized afterwards that I didn't know if they were safe for it.

After coming out they've turned from silvery to looking like they have a chalky white "coating" all over, that won't wash off. It feels very strange to the touch, almost like a chalk board. 

The "coating" (I'm guessing it's actually a lack of coating, that the dishwasher destroyed) is very uneven over the pans.

Nothing comes off on your fingers when you rub or scratch at it, though.

Are these still safe to bake with? I'm perplexed and don't know what to do with them now.
That sure looks like anodized aluminum that has been put through the dishwasher. I have never seen a non-stick coating that washes off in the dishwasher.

If it is anodized aluminum then it is harmless to continue using the pan.

I suggest contacting the manufacturer (stamped on bottom) if you want to be safe.