[chr1]

Do you feel like you need different terms when you look at sky, at blueberry and lapis lazully? You probably do, but do not need to distinguish them often enough to justify promoting words for them into primary colour words. Similarily its possible to have a situation when there is a single word for green and blue, and people make do with saying "grass grue" and "sky grue" in cases when they need to distinguish between them.

[gpderetta]

> Do you feel like you need different terms when you look at sky, at blueberry and lapis lazully?

FWIW, in Italian the sky is commonly referred as 'azzurro' (azure), except when it really is a deep blue, while a blueberry would definitely be 'blu' (blue). So, yes, in Italian we tend to distinguish the two colors more than, for example, english. Which I guess is the point you are making.