I try to add a grunge map here, but the color is not showing. Anyone knows what couse this? Thanks a lot!
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This is because the background texture is a grayscale image, so the texture inserted on the foreground MUST be the same type of image(in this case, grayscale). If you want to convert the grunge to a color, I suggest using a gradient map on the grunge map. The one key takeaway from this, is that the half orange half grey symbol on a mode means that what type you put in there will likely depend on what type you insert into other parts of that node.
But if you would like to still use a blend(there are numerous use cases where a blend would be smarter than a gradient map) to make the base color, I would suggest (in your case) blending the noise and the texture together and then creating a blend node, attaching a uniform color to each foreground/background node, and attaching the blended grayscale texture in the mask slot
Or just using the noise as a mask instead of the full texture then making the texture (without the noise blended in) whatever color you like, and using a blend color or something
In addition to the information given by @radlolyoshi5E2E , you will see that many nodes have a dot in one of the input connectors. That input is the primary input and is used for inheritance of parameters such as output size and also where a node can be colour or grayscale which of the two is chosen.
You can read more about inheritance here : https://substance3d.adobe.com/documentation/sddoc/inheritance-in-substance-compositing-graphs-225971...