Platinum is a warm grey platinum color. Esslinger disliked the beige color used for the Apple II, III, Lisa and original Macintosh. So an off white color was used instead. In PANTONE's color system, the color used for the SE/30 is probably closest to
420 or
421. According to Apple, "Apple does not normally use PMS color charts or Pantone color numbers to designate the platinum color that is now the company standard. Our platinum color number on a coded PMS chart is somewhere between 420 and 421, somewhat closer to 421. (This depends on the age of the chart and the light source used for viewing it.)"