Spectra 77 / 77BL / 177 / 973 / 977 / 977T / 979 / 981 / 991 / 999 / 979M / 986 / 2977 BL Brightener Description Application: They produce brilliant, highly levelled and ductile deposits. Suitable for a very wide range of operations, including rack and barrel operations. They perform best in conjunction with Nickel Additive 22 / 220 / 22M / 232. The Growel Advantage: The spectra range of brighteners is a highly advanced system of Nickel brighteners and The Spectra 77BL, Spectra 997 BL, Unispec 8, Spectra 177 & Spectra 2977 BL boast the capability of producing bright, lustrous and exceptionally high levelled nickel deposits in the barrel plating process. get a quote