I dont think the dichroic separation on blue is due to water vs alcohol vs mek vs acetone based. I always thought it was the dye itself, not the carrier. However, thinking on it... maybe there's something to that. What I found, made me think along these lines was some plain paper towel dipped into the dye. What was at first blue, soon became teal, yellow and brown on the paper towel. Most of it was teal, going to a yellowish teal, and then a sharp ring of brown at the edge of area where the dye stopped - maybe because the carrier finally evaporated. This was all due to something like capillary action, with the dye being drawn through the fibres of the paper towel, just like the fibers of the wood. I'm not sure if I re-wetted the towel, with acetone or mek, that the crawling of the dye would continue, and it would eventually separate into a true yellow vs the brown that was left behind.
Again, I thought that this was due to the type of dye, not the carrier. But seeing as "maybe" the way capillary action, evaporation, etc comes into play, it might be made better or worse with some carriers than others. I used Mohawk blue "Ultra Penetrating Dye", and I thought it was an Azo based dye, but I'm not sure anymore. I'm sure it wasn't an aniline based dye.
From what I've seen - Warmoth has had its own similar situation with blue in the past. There was a time when the blue tops were fairly green looking, especially evident on blue bursts that were sort of tealish in the middle and then transparent blue on the bursted edges.
Blue, it seems, has been a real pain in the rumpskee.
