If it's going into the plaster then over time it'll saturate it, will spread out from around the waste (if it is that), you can see it below the basin, and above to a lesser extent. It's probably aliens.
@Dammit started
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If it's going into the plaster then over time it'll saturate it, will spread out from around the waste (if it is that), you can see it below the basin, and above to a lesser extent. It's probably aliens.