Mephiston Red vs Ruby Red

How close are they?

ΔE 14.3, fair: the same colour family, but not a straight swap. Ruby Red is a little lighter, more muted than Mephiston Red.

Can I use Ruby Red instead of Mephiston Red?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Ruby Red is a little lighter, more muted than Mephiston Red.

Can I use Mephiston Red instead of Ruby Red?

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

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.