I commented on your post on FB. I have always believed the shade of green used on the Caronia was more of a 'white/green' than the brighter shade of your Carinthia.

I wonder if the shades were constant? The precedent for this is the large number of paler blue warships that are still around compared to the more usual bright blue. They can't all be down to fading in the sun.

By the way, I also believe your funnel will turn pink before the green shade tones down from exposure to the sun.