Hi Jeff,
It is only a color change. I have noticed that the color change is most prevelent depending on the angle of the light. As you can see in the last picture, if you get the right angle, the steel looks to be a homogenous color. However, when viewed at a different angle, the lower half of the blade shows a much darker coloration and the pattern has stronger contrast and you can barely see the pattern above this zone. From a metalurgical point of view, is something going on with light and how it reflects off the surface of the blade and how does angling the blade create a different look and color to the steel?
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