>>1488112Bite it.
If it's too hard to leave teeth mark, it's not gold.
Stick a magnet to it.
If it's attracted, it's not gold.
Dunk it in bleach.
If it tarnishes after a while, it's not gold.
Measure the density.
Precision scale to get the mass.
Graduated cylinder filled with water to get the volume.
Divide the mass by the volume of displaced water to get the density.
If the density doesn't match that of gold, it's not gold.
