This is the make of oil colour I use, handmade in the UK, best in the world.
These colours are linked to 60ml tubes, but also available in 40ml if price an issue, but better to get 60ml where possible.
More Info - am still busy on this section- see Michael Harding website link below
Ultramarine Blue (No. 113)
Cobalt Blue (No. 506)
Cerulean Blue (No. 603)