yes and no, silver is not very reactive so there are several reactions which will precipitate a very fine silver layer. one of these is used as a chemical test by most chemistry students at school. it deposits a very fine silver mirror efect on the inside of the test tube. if you did this over the core it would deposite the same silver layer. if done carefully and slowly it is possible to build up a very high purity layer. then you would need to carefully machine lap it flat. it would take a while and you would have to be careful not to get any impurities in the layer.