WWI German Grey-Green Primer vs White Grey

How close are they?

ΔE 8.6, close: similar, with a visible difference side by side. White Grey is a little lighter, more muted, warmer than WWI German Grey-Green Primer.

Can I use White Grey instead of WWI German Grey-Green Primer?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). White Grey is a little lighter, more muted, warmer than WWI German Grey-Green Primer.

Can I use WWI German Grey-Green Primer instead of White Grey?

The same difference applies the other way round: WWI German Grey-Green Primer is a little darker, 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.