Wow! I may have learnt two things here,
however, why do I think vermilion to be
a deeper scarlet red

I'll have to chase up the QV Jubilee vermilion
and flag it as an example.
As usual, Nigel is correct

(and I have been spelling it incorrectly

)
I typed in vermilion across my database
and orangy red looks like the majority,
the colour chip and the machin look deeper
but maybe die to the "solid" colour
