I'm going to resurect this thread. I have one of these so-called unique orange Ibanez. For the longest time I thought the color was Carotene Orange, until I saw a CO and one like this side by side in a photograph.
I've been told that this particular RG570 or RG770 were talking about is/was reserved for Ibanez Dealers only and certain dealers got them, for the staff, limited number of them went out, they were never put in the catalog.
I "just" got myself an 89 RG560CO and I want to compare them side by side. My RG570(or RG770 since its got sharkstooth inlays) has been with me since the day it came home (yup, from an Ibanez dealer). I asked the salesman if he had anything bright (this was back in 89) and he said, "hang on!", came back out from the back with a brand new bright orange Ibanez, matching headstock.
For the entire time I've had mine, I thought it was CO, until recently after I saw that photo of an RG560CO and the mysterious orange 560/770. When my RG560CO comes home, I will take detailed pics with various cameras to expose the color(s).
The OP is right, the Orange we are talking about on these guitars isn't CO, but it's different, almost a mix of CO and RFR, very, very unique. And total METAL! (hairband metal! baby!!)
BTW, here is a link to mine.