Same colour in different materials

[Racleborg]

Is it possible to have various objects with their own material but share a colour, so that if I change the colour on one of the materials it will update in all the other materials?

An example would be a cushion with buttons. The cushion has Material A, the buttons have Material B, but they both share the same Constant Colour node.

Thanks

[B.Y.O.B.]

Yes, the texture node trees are intended for this use.
I made a short video for you showing how to set this up, I hope it's clear enough:
https://youtu.be/-bLR6PDk79E

[Racleborg]

I made a short video for you showing how to set this up, I hope it's clear enough:

Yes, very clear. Thank you

That is going to make things so much easier for me in the the future, from way that I have been doing things.

Many thanks again