xue yue

Maybe like that:

What is the blendshape doing? This node is used to morph the shape of a topology with same point count. There is Cd written in the "Point ID Attrib" which also makes no sense.

If you want the color to fade try an attrib blur to mix these colors. Or just make an attribute that gets transferred from the box (value 1) to the grid (value 0) and remove it every step a bit with the attribute adjust. Use this attrib then for the color gradient later (color sop).

I had the exact same issue, and lowering the "specular multiplier" on the light to ~0.95 solved the blue tint.

But good to know that it is resolved now.