Phthalo Blue GS vs Blue Violet

How close are they?

ΔE 14.7, fair: the same colour family, but not a straight swap. Blue Violet is noticeably lighter, more muted, warmer than Phthalo Blue GS.

Can I use Blue Violet instead of Phthalo Blue GS?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Blue Violet is noticeably lighter, more muted, warmer than Phthalo Blue GS.

Can I use Phthalo Blue GS instead of Blue Violet?

The same difference applies the other way round: Phthalo Blue GS is noticeably darker, more saturated, cooler.

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.