The document discusses the key differences between affinity and substantivity in dyeing. Affinity refers to the artificial attraction of dyes to fibers, while substantivity is the natural attraction, which is also affected by temperature and varies with catalysts. Substantivity is quantitatively expressed, whereas affinity is qualitatively expressed.

1. Difference between Affinity &
Substantivity
No. Affinity Substantivity
1. Artificial attraction between dyes & fibers. Natural attraction between dyes & fibers.
2. Quantitative expression of substantivity. Qualitative expression of affinity.
3. Generally not depends on temperature. Depends on temperature.
4. It varies with the degree of catalysts Color strike is the result of substantivity.