Datacolor User to User Support Group.

--- In colorvision_group@yahoogroups.com, "Terry Ritz" <t.ritz@...> 
wrote:
>
> Problem solved fyi. I had something covering part of my white 
calibration
> pad. 

Terry, I found myself in the same situation, mostly ink transferred to 
the pad which wiped clean with a tissue and a bit of friction.  I am 
also curious about the material used in the calibration area.  It feels 
to me like Delrin or possibly one of the UHMW plastics.  Both should 
wipe clean easily but I know that Delrin does turn whiter and chalks 
after long exposure to the sun.  There must be a Master somewhere or 
some formulation for calibration of the disks and with that I would 
assume a way to re-calibrate the disk after a given time.