Large, flat and extremely fine stone in a wooden box for verifying the authenticity of precious metals such as gold, silver and platinum in jewellery by acid test or acid scratch test. The stone has a height of 1.3 cm and is available in various dimensions. Due to the uniform dark colour, even the smallest traces of material can be detected. You will also receive a beautifully shaped wooden box that protects your stone from contamination, which can influence the test result. The required chemicals are not included in the scope of delivery.Stone dimensions: 76 x 153 x 13 mm
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