It's actually white when new(it was paper Micarta). It turns yellow with age and exposure to varying chemicals(oil, body and petroleum based, sun, salt water, WD40, etc.) . It's more of an orange yellow lke very old Ivory,. Not unpleasent at all. Early Al Mar folders from the late 70's early 80's used this material also, for scales. I have two of them. The boxed one is still white. The one I carry is dark yellow.
Some knifemakers got together years ago and figured they could pressure Westinghouse into making this stuff that would stay pure white all the time(only God knows why). Westinghouse just quit making it altogether as knifemakers weren't a pimple on their ass, and they had thought of discontinuing the stuff due to lagging sales anyway.
For some reason the stuff is more toxic than regular Micarta when worked without protection.
BTW, it's almost impossible to find anymore unless you run across someone that has an old stash.