The colors below represent a close approximation of the actual pen colors.  It must be kept in mind that plastic colors were mixed in different batches as production warranted and thus, some degree of variation in shades is to be expected.  This is especially true in the Vacumatic "51" colors, such as the grays and cordovans.  In addition, the earlier pencils were made out of celluloid instead of lucite.  The pencils will discolor to a darker shade than the pens, to the point that they no longer appear as a matched set.  This can become very pronounced in the grays, which will almost turn a translucent green and the cedar blues which can turn nearly black.  Celluloid plastic will also become brittle over time and will tend to crack if stressed.

51 Vacumatic Filler Colors Color Name Years Cordovan Brown 1941-1948 Buckskin Beige 1941-1948 Yellowstone 1941-1948 Nassau Green 1941-1948 Cedar Blue 1941-1948 Dove Gray 1941-1948 India Black 1941-1948	51 Aerometric Filler Colors Color Name Years Cocoa 1948-1972 Burgundy 1948-1972 Plum 1948-1949 Midnight Blue 1948-1972 Teal Blue 1948-1972 Forest Green 1948-1972 Navy Grey 1948-1972 Black 1948-1972
Reproduced with permission of Michael Richter.  ?? 2002 Copyright by Michael Richter  All Rights Reserved.