2017 EPA Award as well :

https://www.epa.gov/greenchemistry/green-chemistry-challenge...

Here seems to be some examples of printed images on Blue4est paper[1].

[1]: https://thermalprintcameras.wordpress.com/blue4est-paper/

One shop network used blue paper here but changed to white some time ago.

Contrast was not great but I guess the price was the reason for the change.