Essays and Analysis

The company has a modern internal laboratory chemical analysis which makes it reliable and competitive at every level, determining the amount of gold and silver by the method of cupellation. Thanks to our lab we are able to assist clients with analysis to check the products at various stages of processing, possibly certifying the results. The technical standards of reference for determining the fineness of gold and silver are provided by the Regulation for the implementation of Legislative Decree No. 251 of 1999 (UNI EN ISO 11426/2000).

The analysis is the system by which it determines the title of purity and thus the quantity of valuable material content through the method of cupellation. This system was also used in ancient times and it is mentioned already in Egyptian history since 1360 BC

Firstly, a sample is taken of about 0.25 g, through the drilling, then it is placed on a thin lead sheet together with silver d'inquartation with a ratio of 1 to 3 and the following is inserted in a cupel (the crucible) inside an oven at a temperature of 1150 ° until complete cupellation of all the metal; The smelting of lead produces lead oxide which incorporates base metals (non-noble). With this procedure we obtain a bead that passed through a rolling mill transforms it into a thin strip so that the separation of acid, nitric acid, can act more effectively.

It then puts the strip in a flask along with products that prevent acid to overflow and you bring it to a boil. This should be done two to three times. The result obtained at this point is a croissant gold that will be placed in a crucible for the final annealing at a temperature of 800 ° / 1000 °, at the end of this operation we will weigh the croissant of pure gold and proceeds with a simple calculation of the ratio between the initial weight and the final weight, multiplied by a thousand, we will confirm the purity of the sample analyzed.