Color Shifts Through Black Holes

So I feel like I received a response to how dimensions might be linked in my dream last night, buried deep in a sea of seemingly mundane things. 

The insight is that, assuming native observers to a universe and objects passing through a black hole, the colors of the objects in each universe might differ when observed. Since light moves at a consistent rate seemingly regardless of where it goes, and light can still be moving the same speed here but based on factors we call frequency and wavelength end up appearing a different color (these factors of course remain in the non-visible spectrums, but we can measure those differences as well), it would stand to reason that if light could be sent into a black hole and then measured again either on the other side or after a complete loop that the color of the subsequently measured light would provide insight into how dimensions were different on the other side of that black hole, or if multiple holes were passed through it would provide a single combined set of information for all dimensional gates passed through.

Interestingly, if there is a loop of some kind in nature, and communication could be near instantaneous across vast distances or observation and calculation could be exceptionally precise at a distance, I could see this being provable even now. If one knew when and what to look for in the cosmic background radiation being emitted, and an event of a particular type could be plotted as it reached a black hole, one could link what went into the black hole to what came out of it. I feel like, since it seems the CMB remains constant save known expansion effects, that this loop back to our universe does not currently exist in nature, and the black hole that would result in the aligned timeline needed may still need to be fabricated in order for this effect to become apparent and measurable. Still, it is interesting to think that if one could communicate through a black hole then red light sent in might appear as green light on the other side, because of the different dimensional makeup of that universe, despite everything else developing in a relatively similar way within each universe.

This came about from a small, nearly forgotten, scene in my dream last night where I caught a glimpse of my old roommate's watch in a moment where it was like he and I were synchronizing our watches. Out of his watch hovered three green crystals, and time slowed, seeming to pause for some amount of time so I could get a good look before proceeding. I considered that such a crystal might hold its shape through a black hole, if it were crystallized in the correct configuration, but that its color would be different when it emerged. I am also now realizing that if you simply sent a bunch of differently shaped crystals of the same color through, based on your assumptions about what the universe on the other side might be shaped like, with enough attempts it would be likely that one would emerge as intended. With slightly more information you could likely form each with a slightly different color so that if you received information back you could quickly narrow in on which crystal had made a round trip. I like how this is basically the "shotgun approach" to experimentation I've been looking for, but it still narrows down into something that can be replicated using the scientific method, once any success is acheived.

I am also considering the rainbow here, being an early sign of a promise from God. Could it be that other universes would have differently colored rainbows? Like the pattern of colors would change because water itself was formed differently in this other universe, and therefore refracted light differently? This is difficult to wrap my head around, but I would imagine that regardless of if rainbows look the same or different in each place it would be a meaningful result, because either way it would give us some insight into how matter formed in relation to the native set of dimensions. It could be that we could identify the differences in dimensions just by examining a rainbow, or it could be that we find even foreign universes are not all that different from home.