Visible marks doesn't mean it's still damp necessarily. The damp will have moved anything soluble around with it which usually means you can still "see" it after it's dry.
I put a hairdryer on it and it dried further, so I’m not convinced it is fully dry
Drawing a pencil line around the perimeter marks any spread / contraction
@apc started
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Visible marks doesn't mean it's still damp necessarily. The damp will have moved anything soluble around with it which usually means you can still "see" it after it's dry.