First of all thanks for the replies, This is a great place to share ideas.
The point is, may be the color shift does not happen scene by scene, but from dense scenes (dark ones wich tend to some color near the cyan, and bright scenes wich tend to redish tones), not all the same. This is the problem, we know that, but the C-reality telecine in Da vinci 2k, had turned all the chroma down, balanced for B&W, there is not a chance of getting those colors to the transfer, is there?, How is that possible if all the scenes have been monitored always with the waveform monitor and vectorscope and all electronic stuff, and the chroma was always cutted away?.
The solution is in the timing I think, because we tried all ready to take out the chroma in the laser graphics machine in the data to film process, and the result was the same. So the color shift is in the lab, I think.
greetings
Martin Boege DP, Mexico City