How do you manage to write an entire article on blue without mentioning methylene blue?

In a similar vein: https://www.scienceabc.com/eyeopeners/why-are-blue-fireworks...

Blue fireworks look cool, but you almost never see them.

At the Smart Museum in Chicago [0] I've seen Yves Klein's coffee table which uses copious amounts of the iconic International Klein Blue pigment under the transparent surface, it's very striking.

[0] https://smartmuseum.uchicago.edu/exhibitions/building-enviro...

I'm old enough to remember a time before blue LEDs. Funny how they're everywhere now.

I make photo prints using the cyanotype process and a UV LED light source. It's a combination of old and new technologies with a very unique look. While the sensitizing solution contains cyanide, it's fine as long as you wear gloves (and don't drink it).

> Nobody has written about this more eloquently than Scott Alexander: >

For any subject, there is certainly someone who's written more eloquently about it than Scott Alexander (who's quoted using the word "pissed" here).

> It is the most technological color, and I’m willing to claim that this is why it is usually, in science fiction and elsewhere, used to represent the future.

For me it is because of red- and blueshifting[1]. Far away galaxies appear both older and redder the further away they are, so red is the past. And if you go really fast, the forward view will be bluer, so in the sense that it is where you go, blue is the future. [1] https://en.wikipedia.org/wiki/Redshift#Blueshift