Visual Match
Start with what it resembles.
Choose the closest visual fingerprint. Then add location, timing and weather in the Clue Engine. Resemblance alone never confirms a cause.
SHAPEEDGETEXTURELOCATION
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Dark marksBlack window speckles
Clustered dots around cold frames commonly accompany repeated condensation.
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Dark marksGray smudgy window film
A smooth wipeable film may be soot or airborne deposition.
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