it makes zero sense to anyone who learned the sugyos to say there is a psul based on rambam and rashi on color.
1. rama says we aren’t noheg like that shita ???? ?????.
2. the gmara says bfeirush on someonne wearing kla ilan bmkom techeiles ” ??? ??? ??? ???”
3. there is no din min kanaf on techeiles, because otherwise if the talis isn’t tzemer you will never be yotzei min kanaf.
4. also poskim say so mefourosh see yam shel shlomo yevamos 3, mishna berura 9, 14 chazon ish 3, 25 and others.
5. also many assume that even acc. to rambam and rashi it isn’t pasul if isn’t min kanaf