Altdorf Guard Blue vs Indigo Sky

How close are they?

ΔE 11.3, fair: the same colour family, but not a straight swap. Indigo Sky is a little lighter, more muted, warmer than Altdorf Guard Blue.

Can I use Indigo Sky instead of Altdorf Guard Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Indigo Sky is a little lighter, more muted, warmer than Altdorf Guard Blue.

Can I use Altdorf Guard Blue instead of Indigo Sky?

The same difference applies the other way round: Altdorf Guard Blue is a little darker, more saturated, cooler.

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.