Thalek posted at 8:31 AM Tue, 11 April 2023 - #4461693

Here is another example.
Using the Color_math, as I showed you:

And here is an example with the same black & white tattoo, but using a second layer:
Here, the tattoo picture serves as a filter: the white parts force to use the TransparentBSDF and the black parts force to use the Closure1, in this case whatever bitmap
but it could also be a simple color 

For a colored tattoo: simple get a copy turned to black & white and use both bitmaps accordingly
The second layer has one advantage: you may control the specularity of the skin independently of the the tattoo.

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