What is a purple pall for?

The same maroon is maroon.

Mix red and blue to make purple. But, purple as a color is VERY purple. It's more purple than any other color. And, it comes in various shades. Such as periwinkle, magenta, lavender...etc. Hope that...

Yes.

Like most medals, the Purple Heart Medal is made of brass alloy. It has an enamel coating that gives it the purple color.

because someone colored it like that or meant to be like that