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Ving,
I spent some time last night checking out doubles in Crux. I didn't have your list handy; I was working from the list produced by Eagle Creek Observatory (ECO), but there were some overlaps.
In relation to your list and commments:
Beta Crux: ECO just note there to be a double, but my notes read: "two candidates for secondary, 1 orange and 1 grey". I think I saw the triplet you refer to.
Gacrux: I saw the primary as yellow-white, and the secondary as blue-white. According to ECO, separation is 111", they are certainly a long way apart!
Dun117: I only saw primary and secondary, both a dull grey, not worth revisiting IMHO.
HJ4524: I agree it is in a lovely location near the OC. I saw the primary as white and the secondary as grey.
There are some other nice doubles in Crux also worth checking out that did not make it to your list:
Mu Crux: is a beautiful bright double, sep 34"
HIP 60557: located near OC NGC4337, this close double (sep 5.3") looks rather like two eye protruding from the OC, like eyes of an alligator, the OC being the body of said 'gator!
CP 12 (SAO 251919): A great test for seeing, your sight, and your scope, this is a faint double, with 1.9" separation. I managed a clean split with magnification at 450x, elongated at half that magnification.
COO 140: a close pair (4.9" separation), pale yellowish primary. Split easily at 135x.
BTW, I recommend any doubles fans to also check out delta Bootes. I would interested in what colours you see. It is a bit low on the northern horizon for me to be really confident on its constituent colours, but I see a yellow primary and a bluish secondary.
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