That is, the speed of patina formation may be different but the final product will always be more or less the same. The patina of my bronze-aluminum-iron alloy – making it fifty percent harder than standard bronze – develops towards dark gray to almost black when it is very intense. The color depends a bit on the surface - basically the rougher the surface, the darker the patina will be. So polished surfaces, in the long run, will be slightly less dark than sandblasted ones. What a fascinating process, isn’t it?