May not be a chrome coating at all even if it looks like it. The screw drivers "resistence" is the result of what alloys are used in the shank of the screw driver ... ie ... tin, zinc, carbon, etc.
Gold is highly conductive near zero resistance which is why they use it in conducters. Use "specific gravity" type tests or "mass spectromatry" type tests for elements.
Sound looks like sine waves with various amplitudes and cycles per unit of time.
