Tonguez
A suffusion of yellow
Yes a living metalic body (so it sparks when grinding) but not a flesh body (no blood splatter).Regardless if it's organic tissue or merely mimicking organic tissue, Ultron specifically states that it can be used to make a living body.
iirc in the comics Vision turns white due to his skin being damaged in the rebuild (which is a simple explanation) - for the MCU his colours already been drain to grey after he died, so the white might just be a slow recovery