Carbon Black INK vs Ink Sepia

How close are they?

ΔE 15.5, loose: different enough that you should pick on purpose. Ink Sepia is noticeably lighter, more saturated than Carbon Black INK.

Can I use Ink Sepia instead of Carbon Black INK?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Ink Sepia is noticeably lighter, more saturated than Carbon Black INK.

Can I use Carbon Black INK instead of Ink Sepia?

The same difference applies the other way round: Carbon Black INK is noticeably darker, 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.