I thought red was the warmest color.

That is the common thinking, based on heat temperatures and colors.

The english title, I think, is a wordplay.

Normally blue is associated with sadness and therefore with pain and sorrow. Red in the other hand is associated with warmth. I think the wordplay is based on that feeling, like when you are cold and got covered by a warmth blanket... the feeling is nice.

The title ties those opposite colors, and feelings, based on the fact that the pain that brings love is as delightful as the love itself. So the title implies that tha pain of love is warmth, and therefore feels nice... well, that's what I think.

----------------------------
Transmite el conocimiento...

I much prefer "The Life of Adele" as a title... I get that it's a metaphor, but "Blue is the Warmest Colour" seems to have no tangible relation to actual EVENTS in the film, other than the obvious hair colour of one of the leads.






"Your mother puts license plates in your underwear? How do you sit?!"

According to Blackbody Radiation and quantum mechanics, the frequency of blue light is greater than red, hence it carrying more energy, and therefore heat. Blue is indeed a warmer/hotter colour than red! E=hf where f is the frequency of a photon of light, E is the energy, h is a constant.