Carbon Black INK vs Ink Skin

How close are they?

ΔE 21.3, loose: different enough that you should pick on purpose. Ink Skin is noticeably lighter, much more saturated than Carbon Black INK.

Can I use Ink Skin instead of Carbon Black INK?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Ink Skin is noticeably lighter, much more saturated than Carbon Black INK.

Can I use Carbon Black INK instead of Ink Skin?

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