sorry about the meseches tzitzis. i quoted it from memory.
about medrash raba in the regular old printing i didn’t find anyone who was magia. I did find in a computer search a few zohars that clearly compare techeiles to rakia.
most rishonim obviously do not explain the domehs in steps because they compare techeiles to the rakia. the gemara is muchach it is not steps because it says rakia is domeh levnas sapir which is domeh to kisei hakovod yet the pesukim seem to describe them as such and not just domeh which would be mashma rakia livnas hasapir and the kisei hakovod are all one color. vdoi”k
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I am still not sure what point you are trying to get to when we have clear rishonim saying it is blue.
sam2- from what i heard tests get it to fade and get lighter but it doesn’t come out completely meaning it is a shinui