I am puzzled how you can identify color from a book or computer screen . There is a lot lost in translation and each catalog has a different way to describe color then each author of a book has there own way to describe color .
The only true way to describe color is to have the shades represented , is to have the actual stamps under the same light layed out in front of you with the catalog next to them .
My advice is to buy a few classic collections plus buy a few stamps off of dealers or eBay
,now your ready to lay it out in front of you to identify color .