Neon Yellow vs Primary Yellow

How close are they?

ΔE 6.6, close: similar, with a visible difference side by side. Primary Yellow is a little lighter, more muted than Neon Yellow. They are different kinds of paint: Army Painter Neon Yellow is a fluorescent or effect paint and Golden Primary Yellow is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.

Can I use Primary Yellow instead of Neon Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Primary Yellow is a little lighter, more muted than Neon Yellow. They are different kinds of paint.

Can I use Neon Yellow instead of Primary Yellow?

The same difference applies the other way round: Neon Yellow is a little darker, more saturated.

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.