Originally Posted by GraaEminense
On the other hand, there are depictions of mails ranging from bright pink through baby blue to black, I'd like to know if they actually did that -and how...
While I can't comment on the bright pink, I can maybe shed some light on the baby blue/black. Depending on the type of steel used to make the wire for the links, the colour can vary and depending on how the light catches it, it can appear black to almost blue.
The reason why swords and other types of armour don't do the same, is that they're significantly easier to clean and polish, so you tend to have a more uniform shiny appearance (I wonder if an apprentice being made to polish every link of a mail shirt was the medieval equivalent of hazing the new guy?).