Uniform Grey vs Amulet Purple

How close are they?

ΔE 16.4, loose: different enough that you should pick on purpose. Amulet Purple is much more saturated, warmer than Uniform Grey.

Can I use Amulet Purple instead of Uniform Grey?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Amulet Purple is much more saturated, warmer than Uniform Grey.

Can I use Uniform Grey instead of Amulet Purple?

The same difference applies the other way round: Uniform Grey is much 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.