Use the same color for two materials? In my current project, made in Cycles, I would like to be able to use the same color for two completely different materials. That way, I can tweak the color easily and everything will still look fine. Is there any way to do this?

They are emissive materials.

Thanks in advance
One option would be to create an RGB node and then make a group out of it. Then add that group to the other materials. When you change the color in the grouped RGB node, it will change in all materials.