Thank you hborre  I've got it to work correctly 

Here is the V1.3 of the script. It handles correctly PNG's  with a transparent background. The only thing is that you will have to to check the corresponding option, as  for the moment I haven't added a detection 

You can download it here: https://kdrive.digital-paradize.com/app/share/116364/e28a21ef-0eea-424c-bd38-bb34ab95a27d

This...

... give this:

You may have noticed that below the list of mat lies a button: it can detect and remove the nodes added by this script (and only them), restoring the skin as it was before:

The label of the button has "..." because a confirmation is required:

The removal process works by detecting the label and the type of the involved nodes. If no corresponding nodes are found, or if no material is selected, nothing happens, of course.

Again: feel free use the script from the Pose room, but be careful in the Material room: make sure that the selected material is not involved in the addition/removal of nodes.
In my case Poser really hates this and crashes almost immediately.

Have fun

𝒫𝒽𝓎𝓁

---

(っ◔◡◔)っ

👿 Win11 on i9-13900K@5GHz, 64GB, RoG Strix B760F Gaming, Asus Tuf Gaming RTX 4070 OC Edition, 1+2 TB SSD's, 6+4TB HD
👿 Mac Mini M2, Sequoia 15.2, 16GB, 500GB SSD
👿 Nas 10TB
👿 Poser 13 and soon 14 ❤️

𝑀𝓎 𝒢𝒶𝓁𝓁𝑒𝓇𝓎