Mucky ducks - common colour issues

There are certain Whitefriars colours that are regularly misidentified, and the ducks came in some of these. All manner of variables affect how a colour is perceived, I hope I can give you some slight variation in lighting here, that helps to identify these commonly argued-over colours. Don't shoot the messenger!

Here we have four of the Later style duck, made from 1960 onwards, all 5.5" tall. See notes below the pictures for the date range for each colour in this style.

Left to Right we have Ocean Green, Arctic Blue, Silver & Twilight.

As you can see, particularly for Ocean Green & Silver, the effect can be significant.

The production period by colour for this Later style for the above four colours :-
Ocean Green - 1960-65
Arctic Blue - 1960-70
Silver - 1971-73
Twilight - 1960-71

Since my goal was to assist with colours, here are all the others in the Later style :-
Ruby - 1960-74
Flint - 1960-74
Amber - 1960-63