We have a standard set of colours for our publications, which are documented in the Design Programme, which is available on the Cloud (accessible via the Hub) by searching for "Design Programme". As it is a large PDF, here is a light-weight summary of the colour scheme. As a convenience to web authors, this page also has the hex values of the colours. If you need CMYK or PMS codes, they are in the original document, which is also the place to go for the full guidance.
When you see the logo it’s often black on green, but it can also sit on the other backgrounds.
Our colours symbolise the intersectional nature of XR. The colours can and should be mixed together to create bold and bright graphics.