Combining textures in Blender cycles

Hi there,

In Cycles
I am trying to combine two processed textures, but I can only have one of them shown at the time.

  1. I have tried to combine the textures with a color mix node - did not work
  2. Tried to attach each texture to a shader and then combine them with the mix shader - did not work.

Do you know how?

Thanks in advance.