Runic Cobalt vs Phthalo Turquoise Light

How close are they?

ΔE 13.2, fair: the same colour family, but not a straight swap. Phthalo Turquoise Light is a little darker, more saturated, cooler than Runic Cobalt.

Can I use Phthalo Turquoise Light instead of Runic Cobalt?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Phthalo Turquoise Light is a little darker, more saturated, cooler than Runic Cobalt.

Can I use Runic Cobalt instead of Phthalo Turquoise Light?

The same difference applies the other way round: Runic Cobalt is a little lighter, more muted, warmer.

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.