It wasn't really an alliance, as Denmark and Norway at the time were united under the same crown, and thus basically were one country.

I'm theorising from what is laid out in your own source, that it might be caused by contamination. I find contamination much more likely than the Egyptians having trade routes with pre colombian people.

Ok, so they found traces on the mummies, not in the tombs, and they have only been found on mummies in that museum. I'd say it's much more likely that someone probably thought it would be fun to do lines on the mummies at some kind of after work party.

Please provide a source for such an utterly preposterous claim.