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A dark line starts at the lower corner of a shower return and climbs beside the sealant. Under warm light it reads almost brown; under cooler inspection light it looks grey-green. The bead is still attached, so someone proposes laying fresh sealant over it. I stop that work. White marble sealant joint staining<\/strong> may sit on the surface, inside the stone edge or behind the joint, and another bead can bury the best evidence.<\/span><\/p>\n I inspect the marble, sealant and adjoining finish as one interface. The mark’s width, direction, wet-use response and relationship to the bead matter. Don’t just look at samples. A compatibility test on a clean offcut cannot reproduce a joint contaminated by cleaner, moisture or an unknown primer unless those conditions are included deliberately.<\/span><\/p>\n