Mephiston Red vs C.P. Cadmium Red Dark

How close are they?

ΔE 11.9, fair: the same colour family, but not a straight swap. C.P. Cadmium Red Dark is a little lighter, more saturated than Mephiston Red.

Can I use C.P. Cadmium Red Dark instead of Mephiston Red?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). C.P. Cadmium Red Dark is a little lighter, more saturated than Mephiston Red.

Can I use Mephiston Red instead of C.P. Cadmium Red Dark?

The same difference applies the other way round: Mephiston Red is a little darker, more muted.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.