I have caulking around the base of the shower and tub and it turned yellow. Is this normal? It was transparent to begin with.

yellow caulking

  • that is probably soap residue
    – jsotola
    Feb 26, 2019 at 5:33
  • Do you know what the composition of the caulk is? 100% silicone? Or something else?
    – atanamir
    Feb 26, 2019 at 5:44
  • 1
    Grout was probably not sealed before the silicone was put on so the grout has changed color a bit and looks yellowish under the silicone. Feb 26, 2019 at 17:09
  • 1
    Sun light? Calcium, Lime, Rust, Mold, Mildew, can also discolor caulk. Apartment...you own or rent? Rent, let management know and they can fix it. Own, scrape it all off, bleach and allow to fully dry before applying new caulk or your choice.
    – Jeff Cates
    Feb 27, 2019 at 3:08
  • 1
    Brands are off-topic, but best to get a quality tub and tile/shower. One for wet surfaces.
    – Jeff Cates
    Feb 27, 2019 at 14:30

1 Answer 1


As mentioned by one user, the grout was most likely not sealed before the silicone was put on. The grout is brownish/grey and indeed it looks like it changed color a bit and now looks yellow underneath the transparent silicone.

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