WWI German Lilac vs Slaanesh Grey

How close are they?

ΔE 12.0, fair: the same colour family, but not a straight swap. Slaanesh Grey is a little darker, more muted, cooler than WWI German Lilac.

Can I use Slaanesh Grey instead of WWI German Lilac?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Slaanesh Grey is a little darker, more muted, cooler than WWI German Lilac.

Can I use WWI German Lilac instead of Slaanesh Grey?

The same difference applies the other way round: WWI German Lilac is a little lighter, more saturated, warmer.

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.