methuen colours reference

hello gentleman! i´m finising an 1/6 th scale nieuport 28 and the colour refrences that i have are in methuen sistem!
can anyone help me with humbrol, tamya or federal standard
here are the colours:
DARK GREEN 1 F 4
LIGHT GREEN 1 E 4
BEIGE 4-5D/E6
CHESTNUT BROWN 6F5-7
ECRU 4-5C/D3-4
THANK YOU VERY MUCH!!

You could take a look at
http://www.theaerodrome.com and ask the question; another interesting site is
http://fp.bio.utk.edu as Methuen is used by botanists, but it is only in terms of culture, as there is no colour plate.
Hope this will help

I thought Methuen was an actual quantified color scale. Why then, are Methuen colors given numbers if it’s a purely subjective system? I think some of our friends from the UK can help us here. I also recall that the paint chips in the back of Monogram Publishing’s US Army Air Service/Army Air Corps Color and Markings Guide, Vol. 1, 1911-1941, has some color chips that are matched to the Methuen system because the FS system was not yet even a twinkle in a bureaucrat’s eye back then.
Tom

Well, according to Klaus, Methuen is out of print for ages, and was nevertheless very “unstable” from one issue to the other; BUT it seems that WW I fans tend to refer to it ( after all, it was used at that time)