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Pure silicone caulk is mold-proof, even in the white variation. The various "improvements" in many caulks allow mold to get a foothold.

After decades of owning multiple bathrooms and only using products advertised as 100% silicon caulk, I can assure you that it is not mold-proof.

does "mold proof" mean mold won't grow on the surface, or that mold will not affect the silicone?

Luckily mold is not chlorine bleach proof, but grout and silicone are