New Extra Large Acid Test Stone
This is a new acid test stone
  This stone is used to test 9ct, 14-15ct, 18-24ct,silver and platinium.
  Use this stone with acid solutions to test your item.simply rub test subject onto stone and apply testing solution directly onto the stone.
  Great way to test without marking the subject
  It measures approximately 8" x 3" x 1/2" (200 x 76 x 12 mm)