Hashut Copper vs Iron Hue

How close are they?

ΔE 48.8, loose: different enough that you should pick on purpose. Iron Hue is noticeably lighter, much more muted than Hashut Copper.

Can I use Iron Hue instead of Hashut Copper?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 49). Iron Hue is noticeably lighter, much more muted than Hashut Copper.

Can I use Hashut Copper instead of Iron Hue?

The same difference applies the other way round: Hashut Copper is noticeably darker, much more saturated.

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.