Cobalt Metal vs Cold Open

How close are they?

ΔE 19.7, loose: different enough that you should pick on purpose. Cold Open is noticeably lighter, more saturated, warmer than Cobalt Metal.

Can I use Cold Open instead of Cobalt Metal?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Cold Open is noticeably lighter, more saturated, warmer than Cobalt Metal.

Can I use Cobalt Metal instead of Cold Open?

The same difference applies the other way round: Cobalt Metal is noticeably darker, 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.