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CIE/IR/IE "orange/tan" is probably going to be as contentious an issue as CIE Green. "
True, but it needn't be, as ample photographic evidence exists. As far as green is concerned, CIE used the dark brunswick green shade now to be seen on 800 in Cultra. This is original, as i have compared it with a board painted in the 1940s with the Dublin United Tramways green - which it was a direct copy of. No modern theories, no copies of paint on models, can overwrite this. The example I mention is to be seen as a background to the DUTC coat of arms on the wall of Headhunter's Railway Museum in Enniskillen, who I gave it to, along with a collection of other Irish railway coats of arms, all which bear ORIGINAL paint - for those interested! An original DUTC "Flying Snail" is there too - and the green matches 800. This is the dark green, not what 461 carries now, by the way. (Though to be fair, it is VERY close, and the RPSI as always did a SUPERB job!).
This green existed from 1941 (DUTC), then 1945 (CIE) until the mid fifties. The light green which followed is on DCDR's TPO and the Dublin based RPSI Heritage set.
So that's the green.
Orange and derivitaves: The original from 1962 lasted until about 1988 / 90, when a lighter more "orangey" shade came in, as now seen on remaining Mk 3's. Locomotives started appearing in this shade from early 90s.
The colour GM delivered the 071s in was no more orange than it was CIE green! It was a light brown colour, albeit with an orangy tint. Quite a dull shade - in fact, it even made the OLDER orange livery on carriages look very bright beside it.