Precious Stones a book of Reference for Jewellers
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In our eReader you can find the full English version of the book. Read Precious Stones a book of Reference for Jewellers Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Precious Stones a book of Reference for Jewellers
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Red, sapphire-blue, and emer- ald-green are very rare and are highly valued. Orange- color, violet, canary, and rich browns also bring a good price and are growing in favor.
As " off -colored" stones do not bring as much in the mar- ket as those which are colorless, many attempts to eliminate the color by the use of acids and heat have been made, but, so far as known, without success. Unprincipled dealers have also resorted to various devices for neutralizing: the natural PRECIOUS STONES 81 yel...low of off-color stones. The usual method is to paint the under side, around the culet, with violet ink or an aniline dye. This is then carefully rubbed down until the dye can- not be distinguished, but leaving enough of the coloring matter to very much improve the apparent color of the stone when faced up. The effect, of course, is only temporary, and can easily be detected by cleaning the stone with alcohol.
Many of these painted stones have undoubtedly been sold by irregular dealers, who by this means induce the unwary to buy stones at what appears to be much less than mar- ket value.
What to read after Precious Stones a book of Reference for Jewellers?
You can find similar books in the "Read Also" column, or choose other free books by Wallis Richard Cattelle to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Red, sapphire-blue, and emer- ald-green are very rare and are highly valued. Orange- color, violet, canary, and rich browns also bring a good price and are growing in favor.
As " off -colored" stones do not bring as much in the mar- ket as those which are colorless, many attempts to eliminate the color by the use of acids and heat have been made, but, so far as known, without success. Unprincipled dealers have also resorted to various devices for neutralizing: the natural PRECIOUS STONES 81 yel...low of off-color stones. The usual method is to paint the under side, around the culet, with violet ink or an aniline dye. This is then carefully rubbed down until the dye can- not be distinguished, but leaving enough of the coloring matter to very much improve the apparent color of the stone when faced up. The effect, of course, is only temporary, and can easily be detected by cleaning the stone with alcohol.
Many of these painted stones have undoubtedly been sold by irregular dealers, who by this means induce the unwary to buy stones at what appears to be much less than mar- ket value.
What to read after Precious Stones a book of Reference for Jewellers?
You can find similar books in the "Read Also" column, or choose other free books by Wallis Richard Cattelle to read onlineMoreLess
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