Naphthol Red Light vs Light Red

How close are they?

ΔE 10.2, fair: the same colour family, but not a straight swap. Light Red is more muted than Naphthol Red Light.

Can I use Light Red instead of Naphthol Red Light?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Light Red is more muted than Naphthol Red Light.

Can I use Naphthol Red Light instead of Light Red?

The same difference applies the other way round: Naphthol Red Light is 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.