Turquoise INK vs Ruinous Spell

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. Ruinous Spell is warmer than Turquoise INK. They are different kinds of paint: AK Interactive Turquoise INK is an ink, glaze or transparent paint and Army Painter Ruinous Spell is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.

Can I use Ruinous Spell instead of Turquoise INK?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Ruinous Spell is warmer than Turquoise INK. They are different kinds of paint.

Can I use Turquoise INK instead of Ruinous Spell?

The same difference applies the other way round: Turquoise INK is 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.