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I found a reference to the color of the sulfide red and vanadate rare-earth red. "The Performance of Color Television Picture Tube Phosphor Screens", Austin E. Hardy, RCA, in IEEE Transactions on Broadcast and Television Receivers, Vol 11, Issue 2, July 1965. Hardy says that the vanadate rare earth red had a constant color practically identical to the NTSC standard. The sulfide red, however, was the same as the vanadate at low current, but shifted toward orange at high current. Both of these red phosphors were used with sulfide green and sulfide blue (which are non-NTSC). I have attached some plots showing NTSC, the vanadate red, and the color shift of the sulfide red for comparison. This shift would be rated "large" on a general color-difference scale, about the same as the change from NTSC green to the yellower sulfide green.
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