whites look blue on some leathers and metal. the dyes work, just come material looks better then others with some dyes. More so if the dye or material has a sheen to it.
Long time mmo player: 2004-[current year]
Long time Elder scrolls player: Xbox launch morrowind.
Follower of the dawn and dusk, keeper of the moon and star.
Keep in mind that dyes change color a bit depending on the material they are applied on. That is because rarer dyes tend to have a shine or a tint towards some other color. Some gear has more shiny parts, others are just dull, and will make dyes look very bland. An example of a very bad material is the imperial cloth.
If you are looking for white, there is a comparison at the end of my post linked above. Some whites are harder to get, like Palatine white, which requires to obtain that pvp rank.
[PC/EU] Tamriel Hero, Stormproof, Grand Master Crafter
Dyes ending up an unexpected color depending on what armor/costume you put it on has been a thorn in the side of this game's fashion scene since its inception. I really hope they do it over at some point.
Men'Do PC NA AD Khajiit
Grand High Illustrious Mid-Tier PvP/PvE Bussmunster