Gypsum White vs Light Gull Gray

How close are they?

ΔE 13.7, fair: the same colour family, but not a straight swap. Light Gull Gray is noticeably darker, more saturated than Gypsum White.

Can I use Light Gull Gray instead of Gypsum White?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Light Gull Gray is noticeably darker, more saturated than Gypsum White.

Can I use Gypsum White instead of Light Gull Gray?

The same difference applies the other way round: Gypsum White is noticeably lighter, 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.