[mini magic]

Originally Posted by tortoise

Fwiw, there is no single colour that is "THE" colour.
The first version was chosen simply because it happened to be the orange in stock at a paint company located convenient to the team's Colnbrook works. It was a paint intended for general industrial applications, not for automobile finishes.
The orange used on the Yardley cars was a bit different to that.
In 1996, the original orange was deemed to be not quite clean enough for the LMs, so a third version was chosen for them.
The orange recently chosen for some SLRs was slightly different again.
Another variable is the paint medium: acrylic enamel, two-pack, or water-based. You cannot achieve exactly the same hue with all three.