| Hi Pilou,
 > Or the script if I want keep my models with not yet colors attributed ;)
 
 You don't really need the script for that either - just select the objects that you want to keep and use Ctrl+C to copy them to the clipboard.
 
 Then do File > New to get a clean start, and then Ctrl+V to paste those objects back in again.
 
 Also another way to do it is to select the objects that you want to save and use File > Export to write them into a file, when you do Export it writes the selected objects to a file and in that file the only styles stored will be the ones that were used by those objects and not the full style list unlike "Save" or "Save As".
 
 - Michael
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