Hello! Not a long time ago I've bought Shigeki Tanaka 150mm petty on ebay. It was said to be san mai Damascus knife with VG10 core. What caught my attention is how the blade looks like near the handle: It's not that obvious from picture, but in real life there can be clearly seen a core of much darker steel. Am I right in assuming that different colored core is VG10? If so, why is it so badly centered?