Observation, a reasoned hypothesis and a small test form the basis of reliable technical judgement.
Practise these checks
- Examine the same item under three lighting conditions.
- Distinguish changes in colour, sheen, grain and structure.
- Use precise descriptions rather than simply writing dirty or old.
- Compare before treatment, while wet and after drying.
Learning sequence
- Write one condition description each day.
- Record your assessment before reading the instructor's conclusion.
- Use a small test to evaluate the hypothesis.
- Review whether an error arose from observation or execution.
Memorising brands and product names encourages automatic assumptions. Practise across different materials, conditions and cases.