Is this not another layer(concept o) nignaz ? we have sky blue and turquoise, with primary sources saying is navy, or green or yellow? Or how much of/ how many strings?
Another idea. There is a klal that heftza shel mitzva from the animal realm should be from a kosher source, the only exception I know of is the tolaas shani in the mishkan. Any others out there? I don’t trust the folks at p’til techelet, I will patiently wait for the blue fish with black blood. With fins and scales. There was great effort to posit a Hebrew tahor unicorn of immense size for the yerios tachash. Teiku.