Better Testing Methods Advice

I have been researching alternative methods for testing my metals other than the well-known "magnet test" and "spark test." I am having trouble finding some good procedures for this. I have two ideas and any input or advice would be greatly appreciated.
One: In college chemistry I learned about how to find limiting reactants/stoichometry and I would like to develop a chemical process to find out the exact molecular makeup of the substances that I have using other chemicals.
Two: I thought about using a sensitive enough Ohm meter to test the resistance of the metals that I have and compare them to known resistance levels.

Any thoughts or ideas on accomplishing these tests?

Thanks,



Mikey