Obsidian Pigment Toner vs Riff Green

How close are they?

ΔE 8.7, close: similar, with a visible difference side by side. Riff Green is warmer than Obsidian Pigment Toner.

Can I use Riff Green instead of Obsidian Pigment Toner?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Riff Green is warmer than Obsidian Pigment Toner.

Can I use Obsidian Pigment Toner instead of Riff Green?

The same difference applies the other way round: Obsidian Pigment Toner 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.