How to keep color attribute with attribute transfer

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Hi,
I have a sphere (red) moving on a grid (black) both wired to attribute transfers. I want to keep the the red color on the grid to delete the other areas to make a kind of path/road.

My problem I can’t keep the color sticking to the ground.

Thanks in advance
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You have to use Solver SOP to accumulate the attribute values.
Senior FX TD @ Industrial Light & Magic
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