Okay, you're going on a trip and can only take 10 tubes of paint.

[femmedem]

11. My choices:

Titanium white
Cadmium yellow light
Vermillion
Permanent alizarin crimson
Cerulean blue
Ultramarine Blue

I could stop right there but to get to ten I'd add:
Transparent red oxide
Burnt umber
Yellow ochre
Ivory black

I understand why some people wouldn't include a black in a limited palette, but with ivory black I can use an even more limited palette: the Zorn palette, just titanium white, yellow ochre, vermillion and ivory black, with ivory black working as the blue. The ivory black and yellow ochre make a nice olive green, too.

I work in oils.