Grotesque Green vs UK BSC

How close are they?

ΔE 12.6, fair: the same colour family, but not a straight swap. UK BSC is a little darker, more saturated, warmer than Grotesque Green.

Can I use UK BSC instead of Grotesque Green?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). UK BSC is a little darker, more saturated, warmer than Grotesque Green.

Can I use Grotesque Green instead of UK BSC?

The same difference applies the other way round: Grotesque Green is a little lighter, more muted, 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.