Medium Grey vs Russ. AF Grey N.8

How close are they?

ΔE 10.6, fair: the same colour family, but not a straight swap. Russ. AF Grey N.8 is a little lighter, more saturated than Medium Grey.

Can I use Russ. AF Grey N.8 instead of Medium Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Russ. AF Grey N.8 is a little lighter, more saturated than Medium Grey.

Can I use Medium Grey instead of Russ. AF Grey N.8?

The same difference applies the other way round: Medium Grey is a little darker, more muted.

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.