Fade to Black vs Thondia Brown

How close are they?

ΔE 20.5, loose: different enough that you should pick on purpose. Thondia Brown is a little darker, much more saturated than Fade to Black.

Can I use Thondia Brown instead of Fade to Black?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Thondia Brown is a little darker, much more saturated than Fade to Black.

Can I use Fade to Black instead of Thondia Brown?

The same difference applies the other way round: Fade to Black is a little lighter, much 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.