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Concentrated mixture of pigments (masterbatch) in the form of pellets containing by weight: -50 % or more but not more than 70 % of polyamide-6.6 (CAS RN 32131-17-2), -15 % or more but not more than 20 % of iron powder (CAS RN 7439-89-6), -5 % or more but not more than 15 % of barium sulphate (CAS RN 7727-43-7), and -5 % or more but not more than 10 % of blue pigment, consisting of a mixture of Titanium dioxide (CAS RN 13463-67-7) and Copper(II) phtalocyanine(CAS RN 147-14-8)