Black Insulation, Dirt or Mold? : HomeImprovement

Pics of Insulation

Doing a bathroom renovation now, after pulling the tiles out found the glasswool insulation to be black at certain parts. Can anyone tell if it’s just dirt / dust over time or mold? Insulation has been there probably 20 years. Location is Melbourne, Australia. It does not feel slimy or wet, but quite dry. Thanks!

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