Will mylar block RFID signals?
If anyone can point me to an authoritative source or has personal information relating to this, I would be most appreciative.
Much as I anticipated, you have posted a host of excellent answers that gave me a lot of information I hadn't yet considered.
For my part, I should have included more information concerning my project in my question.
The Skinnerz response reminded me that I have some scraps of fine mesh stainless steel screen termite shield and I will give that a try rather than mylar for my wallet and passport case.