Affinity

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The quantitative expression of substantivity. It is the difference between the chemical potential of the dye in its standard state in the fibre and the corresponding chemical potential in the dyebath.

Note : Affinity is usually expressed in units of calories (joules) per mole. Use of this term in a qualitative sense, synonymous with substantivity, is deprecated

Textile Resource (http://www.textile.org.uk)

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