Depends on model you are looking at . Some have white many of the Tanks have an Opaline dial with a silvered tint . The 'Guilloche 'can be be white based with silvered guilloche , or vintaged with brass guilloche, the new Dumonts have a silver dial . Some have white mother of pearl dials etc.
SO WHITE like they should be ? Lots of Cartier watches the uninformed think have white dials are NOT in real life . Pick a watch do some research into the gen and decide if the rep dial is correct .
Also forget SWISS REP and look at TD's on here .