Ductolite Tri Nickel Process / Supra Tri Nickel Additive Description Application: Used as a sandwich layer between semi-bright and bright layer in a triplex Nickel-plating system. It also builds a sulphur-rich Nickel layer below the top surface to inhibit corrosion penetrating top and bottom layers. The Growel Advantage: Possesses superior (1.5 times) corrosion-resistance properties when compared to duplex Nickel Chrome deposit of identical deposit thickness. get a quote