Many thanks for the summary "C".
You may be interested in an old thread on the Paul Marteau colours:
http://www.tarotforum.net/showthread.php?t=19560
...and a possible answer? Arnoult?:
http://www.tarotforum.net/showthread.php?t=57539
http://www.tarotforum.net/showthread.php?t=23541 (this thread comes full circle), but hopefully others will have more information for you.
[PS, just wondering if this topic deserves its own thread]
