What determines what color the wings are when you get them? Because when I save edit them in their white, but when I get them naturally in game Dark Sylvan is red and Sylvan is blue.
If there's a Wing Style status effect, it uses it's tooltip if one is provided; if no tooltip is present, it takes its first value and uses that as the texture for the following steps.
If the wings' texture is Furred (no naturally-occurring types, outside Wing Style) or Feathered (Avian, Dove), it uses your fur colour; if their texture is Scaled (Demonic, Small Demonic, Frostwyrm, Shark, Gryvain, Draconic, Small Draconic) or Chitinous (Mothrine), it uses your scale colour.
Otherwise, the colour is hard-coded for certain types: iridescent for Dragonfly, transparent for Bee, Small Bee or Myr, blue for Sylvan, and glittering black for Dark Sylvan.