Troglodyte Blue vs Phthalo Turquoise Light

How close are they?

ΔE 11.6, fair: the same colour family, but not a straight swap. Phthalo Turquoise Light is more muted, warmer than Troglodyte Blue.

Can I use Phthalo Turquoise Light instead of Troglodyte Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Phthalo Turquoise Light is more muted, warmer than Troglodyte Blue.

Can I use Troglodyte Blue instead of Phthalo Turquoise Light?

The same difference applies the other way round: Troglodyte Blue is 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.