Basically let’s say I have a sheet of paper and on that paper parts of it have aluminum sections/squares inside (not visible from outside) how can I map out which parts/sections inside contain aluminum using a device like a multimeter?
Can I set it to resistance then touch the leads to opposite sides of the paper to determine the resistance and if less make the assumption there is aluminum inside? Is there a better device than a multimeter for mapping out the sheet of paper to determine what parts have aluminum like a precise stud detector?
What about thermal conduction, is there a device that can measure heat conduction on opposite sides of the paper to determine if there is a sheet of aluminum inside? Can I use a thermal imaging camera to detect subtle temperature differences?
Ideally I would like to obtain an image of the aluminum sections hidden inside the paper/cardboard covering.