What are Iso-thermal and Thermo-migration method of dyeing?

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ISO-THERMAL and THERMOMIGRATION Methods of Reactive Dyeing

For normal and non-problematic substrates and shades, one can select the Iso-thermal method and difficult shades and substrates (canvas and tightly woven fabric), thermo-migration method is suitable.

These schematic diagram represents dyeing method for  HE dyes. But you can apply the same to VS and ME dyes, by changing the dyeing temperatures to 60°C instead of 80°C.