I live in an apartment. Do you think the black stains are normal discoloration or mold? We have to spray bleach/water mix on our bathroom ceiling because the porous concrete ceiling easily grows mold. enter image description here

  • It might be mold. Not all mold is harmful. Get it tested if you're concerned.
    – FreeMan
    Commented Jul 3, 2023 at 11:03
  • Looks like mortar sand Commented Jul 3, 2023 at 16:48


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