Hello,
for those who are interested how plastic is chrome-plated: The plastic material is in most cases ABS (Acrylonitrile-Butadiene-Styrene-Copolymer). At first the material is activated in a diluted solution of chromium(VI)oxide and sulfuric acid. In the next step a very thin chemical nickel layer is applied to make the part electrically conductive (a bath containing a nickel salt and hypophosphite). Then comes a galvanic copper or brass layer followed by a classic galvanic chrome plating. This chromium layer can be glossy, matte or black (I have seen this in Munich in the former AGFA Pocket camera manufacturing plant). Instead of galvanizing the part can also be painted. This process does not only give a decorative effect but also improves the mechanical stability of the plastic material.