Zinc and Cadmium are both a whitish silver metal. Neither is yellow unless they have had a hexavalent or trivalent wash after the plating process. You can also get a blue-ish wash. The various washes add a very thin layer (a few microns) of conversion to the surface as an extra deterrent to corrosion.
Good reading here:
Cadmium vs. Zinc vs. Nickel Plating Comparison
What is the difference between Cadmium & Zinc Plating
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