Gold Pink vs Thallax Gold

How close are they?

ΔE 16.5, loose: different enough that you should pick on purpose. Thallax Gold is noticeably darker, more saturated than Gold Pink.

Can I use Thallax Gold instead of Gold Pink?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Thallax Gold is noticeably darker, more saturated than Gold Pink.

Can I use Gold Pink instead of Thallax Gold?

The same difference applies the other way round: Gold Pink 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.