Ahriman Blue vs Turquois (Phthalo)

How close are they?

ΔE 14.3, fair: the same colour family, but not a straight swap. Turquois (Phthalo) is a little darker, warmer than Ahriman Blue.

Can I use Turquois (Phthalo) instead of Ahriman Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Turquois (Phthalo) is a little darker, warmer than Ahriman Blue.

Can I use Ahriman Blue instead of Turquois (Phthalo)?

The same difference applies the other way round: Ahriman Blue is a little lighter, 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.