The most commonly used Integrity skin tone, Caucasian/White, was first introduced in 2002 with Veronique. The earlier dolls in this skin tone have had a tendency to "yellow" with age. Due to a change in formula to correct this problem, this skin tone had a subtle color change in 2012. Although the bodies and heads are easily interchangeable, there is a very slight difference. The newer tone is a smidge darker. It should also be noted that in 2011 the bodies started being produced in a more "matte" finish. The bodies from 2011 - 2012 are a personal preference as donors for earlier dolls.