At a craft store, you can get something called a "bone folder," like this:
https://www.youtube.com/watch?v=0M7xgVweyEM
Used for adding nice creases to thick cardstock
At a craft store, you can get something called a "bone folder," like this:
https://www.youtube.com/watch?v=0M7xgVweyEM
Used for adding nice creases to thick cardstock