Skink Blue vs Phthalo Turquoise Light

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Phthalo Turquoise Light is a little darker, more muted than Skink Blue.

Can I use Phthalo Turquoise Light instead of Skink Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Phthalo Turquoise Light is a little darker, more muted than Skink Blue.

Can I use Skink Blue instead of Phthalo Turquoise Light?

The same difference applies the other way round: Skink Blue is a little 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.