Metal complex dyes
Metal complex dyes are premetalised dyes , in which one or two dye molecules are co-ordinated with a metal ion. The dye molecule is typically a monoazo structure containing additional groups such as hydroxyl, carboxyl or amino, which are capable of forming a strong co-ordination complexes with transition metal ions such as chromium, cobalt , nickel and copper.
Properties of the metal complex dyes
Fastness: The metal complex dyes exhibit good fastness towards exposure to light , however the wet fastness properties are moderate , particularly in darker shades. However the fastness is also depends upon the fiber type and dye type.
Solubility: These are water soluble dyes.
Application: These dyes are applied from neutral , weakly acidic to a very strongly bath depending upon the dye sub class.
Applicability: These dyes are suitable for dyeing of wool, silk, polyamides and leather.
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