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"In this paper specimens of brass (65% Cu - 35% Zn) were nickel electroplated in a Watts type bath with or without the addition of a suitable concentration of cationic dye Nile Blue.  Electrochemical methods, SEM/EDS and XRF techniques were used in this study in order to evaluate the effect of this dye on the nickel electroplating process.  The dye shifts the potential of nickel deposition to more negative values, decreases the current density under potentiostatic conditions, resulting in a lower rate of formation of nickel deposits, improves the macro- and micro-throwing power, as well as the cathodic current efficiency of the bath, increases the brightness of the nickel deposits and reduces the grain size."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.pfonline.com/articles/an-investigation-of-the-effect-of-nile-blue-on-the-electrodeposition-of-nickel-on-brass-from-a-watts-type-bath>