Why 'Blue'? Who's 'Tooth'?

What we or at least some of us(sleepless people like me) would like is who had these so called 'blue colored tooth'...

Bluetooth is a wireless technology standard for exchanging data over short distances using short-wavelength UHF from fixed & mobile devices thereby building personal area networks(PANs), Invented by telecom vendor Ericson in 1994.

This all we know or at least some of it, courtesy of excessive use of data transfer in today’s ‘smart-gadget’s-world’?

“Men are like Bluetooth, we connect with you when you're nearby, but search for other device when you're far away..” - Random Quotes

The word is anglicized version of the Scandinavian “Blåtand/Blåtann” (old norse blátǫnn), referencing a 10th-century king Harald Blåtand Gormsson(see pic above) who united dissonant Danish tribes into a single kingdom & may have also introduced Christianity in those Vikings land.

OK! So we now know the significance, but it still doesn’t explain why specifically this was picked. To answer that, in 1997 Jim Kardach(system developer of a system that would allow mobile phones to communicate with computers) made this proposal influenced by Frans G. Bengtsson‘s historical novel ‘The Long Ships’[In ‘94 when Bluetooth was still a project Jim Kardach (Intel) and Sven Mathesson (Ericsson), were presenting the technology proposal in Toronto. The rejection of the project was followed by a pub crawl, where during a discussion on the histories of the two countries, Kardach recalled a story he recently had read in a book, the Long Ships, detailing Vikings & King Harald Bluetooth], the implication being Bluetooth unites communications protocols into one universal standard.

Most of this, I got from Wikipedia of course, but there are a few things Wikipedia doesn’t say:-

• The story of the king is corroborated by the Ericsson website and there is also a statue of Harald Bluetooth outside Ericsson HQ (a little tidbit from Serena Jackson, Bromley, UK).

• ‘Blåtand’=Blaa + tand ; ‘Blaa’ is the modern Danish word for ‘blue’, but once meant ‘dark skinned’, ‘Tan’ once meant ‘great man’, and has been confused with ‘tand’, the modern Danish word for ‘tooth’.

• Some historians say that the name ‘Blåtand’ is attributed to Harald’s dark complexion; some accounts even indicate that King Harald was known for teeth of a bluish hue resulting from his fondness for blueberries (although this is probably folklore).

• In Old Scandinavian, there was no linguistic difference between blue and black. Thus – the story goes – Harald had a dead tooth that had turned black (or blue, as the word was back then).In much the same way, North Africa was called ‘Blåland’ (blueland) and African people were called ‘blåmän’ (bluemen).As late as the’ 70s, the derogatory term ‘blåneger’ (blue nigger) was sometimes used when speaking of really dark skinned African people.

Fun fact: When it finally came time to create a logo, it was made as a combination officially known as a bind rune of King Bluetooth’s initials in Scandinavian runes -

ᚼ and ᛒ