Are you ready for this?
Years of production - 1938 - 1980
SUMMARY OF COLOURS
Flint /Sea Green / Amber/ Emerald / Sapphire Blue / Twilight / Ruby / Arctic Blue / Ocean Green / Aubergine / Silver / Lilac / Sage / FLC Aqua / FLC Gold / FLC Sky Blue
Kingfisher and Meadow Green are mentioned in the catalogues but I have never seen these dishes made in these colours.
Also, the colours above were used only for certain years. So for example you will only find a 10" version in the earlier colours and not the later colours, but to go into the specific years and colours is rather long winded at this stage.
Up to mid 1960s were made in sizes as follows. 10 / 8 / 6 / 5 / 4
Beginning of the 70s they dropped the 10 version.
Around 1972 they made only 4.5 and 5.5 bowls.
HOWEVER - all above info is totally useless unless you have a fairly well trained "eye". You need to be able to recognise the Whitefriars colours. Many other makers have greens and blues and ambers, which although could seem similar are not the same. Whitefriars colours in the main were fairly consistent and easily recognisable once you have trained your eye. Another thing is to get used to the "bubble" formation. Again, Whitefriars bubbles are easily spotted once you are used to them. And finally, the polished pontil mark is not specific to Whitefriars - other makers sometimes also finished off their items with this too.
Easy peasey! Or perhaps you will not think so?