In 2000 or 2001 Rocket Red which was more orangey was replaced with Real Red and Lucious Lime was replaced with Creamy Carmel.
Then these was an overhaul or tweaking of colors (mostly rich regals) in 2004 or 2005:
SOFT SUBTLES
Mauve Mist replaced with Apricot Appeal
Mint Melody replaced with Certainly Celery
Bliss Blue to Bashful Blue
BOLD BRIGHTS
Positively Pink to Pixie Pink
RICH REGALS
Not Quite Navy moved to EARTH ELEMENTS, Replace with Always Artichoke
Eggplant Envy to Elegant Eggplant
Forest Foliage to Handsome Hunter
Baroque Burgundy to Bravo Burgundy
Rose Romance to Regal Rose
Marvelous Magenta Replace with So Saffron
EARTH ELEMENTS
Going Gray moved to new NEUTRALS category, replaced with Pumpkin Pie
Basic Black moved to new NEUTRALS category, replaced with Not Quite Navy from Rich Regals
NEUTRALS
Basic Black from EARTH ELEMENTS
Going Gray from EARTH ELEMENTS
Ultrasmooth White changed to Whisper White
Ultrasmooth Vanilla changed to Very Vanilla
Basic Brown was introduced
In 2006 "In Colors" were introduced with:
Vintage Violet
Cranberry Crisp
True Thyme
Marigold Morning
Cool Caribbean
Buckaroo Blue
Sahara Sand was added to the NEUTRALS category.
the 2007-2008 "In Colors" are:
Blue Bayou
Soft Sky
Wild Wasabi
River Rock
Groovy Guava
Purely Pomegranate
Basic Gray was added to the NEUTRALS category.
I hope this answers your questions about Stampin' Up! color changes. I have most all of the retired colors still.
Donna
www.strawberrystampers.com