Our white corian sink in house we just purchased has hundreds of little blue greying lines in bottom of sink. You can't feel them but not at all attractive. Can they be buffed out? Is there a fix?

They were cast in the Corian resin when it was made. Won't be able to buff them out without marring the sink.

As said above, these "lines" (veins) were added into the corian mixture during manufacturing process. They run deep and cannot be buffed out.

Milo