Celestra Grey vs Gravestone Blue

How close are they?

ΔE 6.8, close: similar, with a visible difference side by side. Gravestone Blue is a little darker than Celestra Grey.

Can I use Gravestone Blue instead of Celestra Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Gravestone Blue is a little darker than Celestra Grey.

Can I use Celestra Grey instead of Gravestone Blue?

The same difference applies the other way round: Celestra Grey is a little lighter.

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.