Large gold and silver testing stone that is dark and shows results clearly. Precious metal acid testing stone should serve you for hundreds of chemical tests. Purchase this natural gold testing stones when you need a new high quality surface for your testing chemicals. Used when using test acids for gold jewelry and watches.
- Gold and silver testing stone that is dark
- Product size 3.9" X 2" X 0.3" Inches (99 X 50 X 6mm)
- Thickness 0.27" inches