Metal complex dyes are premetalised dyes that show great affinity towards protein fibres. In this dye one or two dye molecules are coordinated 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.
The following table shows a comparison between 1:1 metal-complex and 1:2 metal complex dye:
|Dye Type||Levelling Ability||Wash Fastness||pH Range|
|1:2 metal complex||Poor||Very Good||6-7|
Metal-complex dyes belong to numerous application classes of dyes. For example, they are found among direct, acid, and reactive dyes. When applied in the dyeing processes, metal-complex dyes are used in pH conditions that is regulated by user class and the type of fibre type (wool, polyamide, etc). The pH levels for wool typically ranges from:
Features of Metal Complex Dyes
Application of Metal Complex DyesMetal Complex Dyes is using for a variety of applications like wood stains, leather finishing, stationery printing inks, inks, coloring for metals, plastic etc. As this dye is classified into two categories and both have different applications.
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