The French are well known for inventing new colours. It started in the 15th century when some new ones were added to the simple heraldic palette and got ‘translated’ into other languages and then re-interpreted later to increase the confusion. By the 18th century it went quite silly with colours to match a princess’ dress and other daft ideas – all just for fashion. To make it worse people started using older names for familiar colours and some of those were still in use for a different colour. What can you expect from a nation that used a white cross on a white flag as a colonel’s colour !!!
The same happens with British facing colours though, even without inventing new colours. What exactly is Grass Green – look at grass and you’ll see it is a riot of different colours so which one do you choose ?