[mod186k1]

For me it seems like light brown, but it depends from the light source. In my case I used a "standard" (what does "standard" mean?) gas lamp of 20w and 2700K. Probably with a led lamp the background would be gray.
But it is not the gray of SiPix, it is something different.

Answering your question: I think so, it could be similar 'newspaper-grey' background. Similar but different also and light dependent.

Also the black is as strong as eink-pearl and so the triton display seems to me to have more contrast than eink first version even with a background less white (I would like to know what Andrew think of it).

Next time I would like to take some photo using sunlight in different hours (morning, evening, sunset) and in different angolation (direct/inderect lights).