Is This Mold or Rust? Something else?

Reply Sun 20 Mar, 2016 10:50 pm
What is this? I discovered it in a heating vent within my home on drywall, not metal. I also noticed some areas around nail heads that have a similar coloration, but there isn't as much of it. I've only ever seen this kind of thing outside on rocks and wood. It seems to be a permanent fixture on the drywall and isn't powdery at all. I haven't attempted removal as I have no idea what it is.

Please see the photobucket pic for an image:


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Type: Question • Score: 2 • Views: 1,396 • Replies: 1
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Reply Mon 21 Mar, 2016 04:13 am
Looks like rust to me.
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