The upper half circle are the body (caisses) colours, the lower half circle the roof (pavillons) colours.
I bought the above set of paint chips on ebay (with the help of a friend). Someone who also bid on this item contacted me after the end of the auction and told me that he was supposed to have win this auction for a friend who is restoring a 1968 DS21, he asked me if this friend could contact me. A few days later Mr. Torsten Ahrens from Bremen called me and asked me if I would lend him this colour thing, so that he could have the individual colours scanned and colour mixing recipes made. He offered me that he would send me the recipes and also the real colours according to those recipes sprayed on pieces of sheet metal.
The results of the scanning with a professional modern colour scanner are listed below :