Phthalo Green (Yellow Shade) vs Ink Green

How close are they?

ΔE 13.4, fair: the same colour family, but not a straight swap. Ink Green is much more saturated than Phthalo Green (Yellow Shade).

Can I use Ink Green instead of Phthalo Green (Yellow Shade)?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Ink Green is much more saturated than Phthalo Green (Yellow Shade).

Can I use Phthalo Green (Yellow Shade) instead of Ink Green?

The same difference applies the other way round: Phthalo Green (Yellow Shade) is 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.