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Mould? Rust?

373 Views 1 Reply 2 Participants Last post by  Nealtw
Some tile was coming off the wall next to the bathtub, and I saw what I was sure was mould.
Then I thought maybe it was rust... then I thought it's obviously got to be rust.

But, I really wouldn't know what "obvious" is, so was hoping someone here could get an answer from the photos.


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Drywall corner bead. Steel.
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