Colour i matched was somewhere between 2 pantone colours...674c and 675c.
The difference between these 2 colours is the ratio of red to white. Colour actually calls for translucent white, this can be ignored and this also explains some of the Munsen system which gives a number of the intensity of the colour from translucent through to opaque.
Anyway - enough useless info whats the code i hear you say...
674c - 4pts Rubine red, 1/4 pt black, 12 3/4 pts white OR 23.5% Rub Red, 1.5% black, 75% white
675c - 8pts rubine red, 1/2pt black, 8 1/2 parts white OR 47.1% Rub red, 2.9% black, 50% white.
Now colour is closer to 675c than lighter one and RUBINE Red is a DEEP red NOT bright fire engine red... and deep red IS NOT red with black added.
So code is ALMOST equal parts red to white with the tiniest dash of black added at the end...
... best of luck!