Blue Flux vs Lothern Blue

How close are they?

ΔE 12.5, fair: the same colour family, but not a straight swap. Lothern Blue is noticeably darker, more muted than Blue Flux.

Can I use Lothern Blue instead of Blue Flux?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Lothern Blue is noticeably darker, more muted than Blue Flux.

Can I use Blue Flux instead of Lothern Blue?

The same difference applies the other way round: Blue Flux is noticeably lighter, 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.