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Access isn't the problem with Quantum X - it's available easily on AliExpress. The problem is the price. ^_^
Before the two color rule (when was that .. 1983?) there were NO rules about what color you could have on your bat. Cheap Chinese bats came in all sorts of colors. I've heard of (but not seen myself) green sheets of Mark V, and I had a sheet of green Spectol. Yasaka Tornado came in this beautiful shade of honey. The original 729 was sort of a plum color. Hardbats came in all sorts of color, too. But most inverted sheets at the time were one color - red. There was a Yasaka Black Power (which was black, and had a very questionable blurb on the back comparing the qualities of the rubber with, er, people from Africa, I kid you not, and Yasaka claimed, also on the back of the packet, that making black sheets was difficult without ruining the qualities of the rubber - THEY had found the secret formula, though), but the first "mainstream" black sheets in common use were Butterfly Tackiness Chop and Drive.
Iskandar
I've never seen a green Mark V but I had a blue one....referring to the Tornado ( not Honey but Yellow for me) and Black Power, I had both in 2.0mm in a H5 Tomi. I had Mgic Carbon in the 4 colours too and the very famous yellow Thibht Golden Falcon.
Red ans blue is a nice combination for me as black and Yellow.