Here is a link to the image of a Chaudière Helmet with what appears to be a 'Blue' colour where it is supposed to be Maroon. As I mentioned in the last post I have always chalked it up to the printing/photographic process as the culprit for its 'blue' appearance....this particular helmet is in Jean Bouchery's book. As an aside, I would love to have this helmet in hand for a closer inspection.
http://www.flickr.com/photos/mlq/4497466234/
Mike