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Nanoparticles are highly emerging particles which are used for textile coloration. Actually, the nano-sized pigment is used in textile finishing. The advantages of using nanoparticles are nanoparticles can be sized in any shape and they can be dispersed well to avoid aggregation of the nanoparticles
Mediators are regenerated iron complexes with gluconic acid as ligands. These mediators are very expensive and not fully harmless from a toxicological point of view. After the reduction and prior to the coloration process the mediator has to be detached from the soluble leuco dye by ultrafiltration.
