This new “Viking Violet” got its name because it is beyond powerful! It dyes in seconds without a film and has a bit of a metallic look to it. It would seem that it could manage without a varnish but for protection, it will still need one. Sometimes the sheen will go away after varnishing.
Here is where it got its name from. https://www.pc.gc.ca/en/lhn-nhs/nl/meadows