Nektan's blood color and the Amporas' blood colors aren't actually violet, they're purple. mspaintadventures wikia page for the Hemospectrum messed a few of the names of the colors up, including "indigo," "violet," "purple," and "burgundy," if that's what you're looking at. Some of the other colors are probably messed up, too.

Going off of the album, coloUrs and mayhem: Universe A

The Blood colours are Rust, Bronze, Gold, Olive, Jade, Teal, Cobalt, Indigo, Purple, Violet, and Fuchsia.

~Mod T