[Jewelry making - Article 00861] - [Orchid] Fair estimate of the gold content

[Joyce]

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    Years ago when the prices sailed up in gold I bought scrap from
    individuals. Being in a very rural location, everything was what ever
    individuals managed to scrape up, from old gold dental crowns to
    broken rings. I made a testing plate out of black slate and marked it
    with the diferent gold karats by streaking the plate. That is,
    drawing a karat gold down the plate to make a mark. Then I took the
    unknown gold scrap and drew a line near each of my karat marks,
    using nitrite acid on a toothpick, I then touched the marks. The rate
    of the alloy dissolving and the amount of visiable residue left on
    the 'plate' usually gave a fair estimate of the gold content of the
    piece in question. I have also used a slab of black jade as a streak
    plate.. At least my customers were satisfied in seeing this happen
    since they were able to see the same process enacted with my own
    marked and known karat gold streaks. 

Joyce
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