Compare surfaces at a consistent visible condition.
Make two records
A recently wet surface can appear different from the same surface after drying. Label photographs by observed condition rather than rewriting the original colour description. If some boards are dry and others visibly wet, preserve that distinction in your notes instead of describing the whole assembly as one tone.
Avoid an improvised moisture test
Colour alone cannot establish moisture content. The observation journal does not convert a darker image into a meter reading. Where a coating or installation decision requires a moisture limit, use the relevant product instructions and an appropriate measurement process, recording the method and material information.
Keep the comparison fair
For a before-and-after discussion, use photographs taken in similar weather and light. If that is not possible, display the difference openly. A cleaning result photographed wet should not be presented as proof of its final dry appearance. Ask for a later dry observation before deciding whether the outcome matches the brief.
- Label visible wetness
- Keep original photographs
- Separate readings from appearance notes
Evidence & scope
Surface weathering research (2020), not a forecast for a supplied board or a structural assessment.
Original planning guidance. References support their stated technical scope; examples and workflows do not establish product approval.