Micha I hardly think what I suggest and the way to test the fraility of the paint would damage the core. Using silver dip like Tarn-x removes a minute layer of silver, most silver collectors can tell if an object has been dipped I don't use this method anymore. A non damaging method for cleaning silver is pan lined with aluminum foil and a solution of baking soda and salt in simmering water. Leave the object in for a couple of minutes until the patina lifts off it leaves the original luster without the appearance of subsequent polishing. Of all the Ek2's I've own (15+) none had this laquer finish on it and really doesn't do anything for the appearance of the cross. At 5+ million of these I hardly think that anything one does to these will affect the value much, these are not Grand Crosses.