Method for detecting imitation gold, using a pen-like device

Details Method for detecting imitation gold, using a pen-like device Method for detecting imitation gold, using a pen-like device

1998-09-14

2000-11-07

Soderquist, Arlen

Chemistry: analytical and immunological testing

Metal or metal containing

Cu, ag, au

356 30, 422 61, 422100, 422101, G01N 3320

Patent

active

061435724

ABSTRACT:
A pen-like device having a scriber for scratching a deep groove in a yellow colored, metal article object, such as jewelry, being tested for the gold content thereof, and an applicator provided on an opposite end of the pen-like device for conveying an acid solution, which is housed within the pen-like device, onto, around and in the groove to observe whether there is a color change to the testing area, on which the acid solution was applied, making the the testing area darker or black, where such a color change would indicate that the metal article or object is imitation gold, or has a gold content which is less than minimum karat requirement of the test. The acid solution includes a specific percentage of nitric acid which changes the color of the testing area when in contact with most imitation gold materials, preferably a specific percentage of hydrochloric acid to coact with the nitric acid, and a specific percentage of selenious acid which changes the color of the testing area when contacting a bronze or brass material. The specific percentage of each acid can easily be determined, for testing gold having a specific karat value.

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M. Janghorbani et al. Anal. Chem. 1982, 54, 1188-1190, Jun. 1982.
K. Bicovsky et al. Chem. Abstr. 1989, 111, 82326h, Sep. 1989.

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