Candle soot, recurring marks and ghosting questions

Keep a pattern record

Photograph the mark from a consistent viewpoint and label its location. Record any known candle use, other indoor combustion sources, changes in operation or timing and previous cleaning/painting. Do not infer the entire cause from the shape of the mark alone.

The word “ghosting” may be used for recurring patterns on surfaces. It should describe the observation, not close the investigation. A room can have more than one source or building-condition question, and an appropriate assessment should explain its basis.

Ask about source and building conditions

A cosmetic finish proposal should say what it does and does not address. Ask whether the known indoor source has stopped, whether the mark is a deposit or altered finish, and whether building airflow or surface conditions require a separate assessment.

General indoor-air guidance starts with source and ventilation questions. It does not identify the composition of a mark or establish a universal product for painted walls. Appropriate material/finish tests are still needed when treatment is proposed.

Before cleaning or painting broadly

• What observations support the proposed explanation?
• Is the source ongoing, confirmed or uncertain?
• How is finish compatibility being evaluated?
• What would justify additional building or equipment investigation?
• What is the follow-up if the pattern returns?

Maintain a recurrence record

Keep dates and locations of any returning marks instead of repeatedly changing products with no notes. A written treatment record can help the next professional distinguish untreated sources, coating issues, different areas and an incomplete original scope.

If affected areas may contain hazardous building materials, establish the relevant identification/control before sanding, scraping or opening them. A small cosmetic mark does not make disturbance of an older assembly a low-risk household experiment.

References and scope

1. Improve indoor air quality in your home — Health Canada.
   Source control, ventilation and limits of filtration/testing; ozone generators are not recommended in homes.
2. Keeping the heat in: how your house works — Natural Resources Canada.
   Building airflow concepts; not a smoke transport model or a restoration specification.
3. Asbestos and your health — Health Canada.
   Potential materials and disturbance risks; qualified identification/testing is required, not a visual age-based diagnosis.

Source links checked September30,2026. General guidance and original planning questions do not establish the condition, exposure risk or clearance of a property.