Chapter 14 Notes - Chapter 14 Gemstone Enhancement F oils,...

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Chapter 14 Gemstone Enhancement Foils, Colour Backing, and Dyeing Another relatively simple way of improving or changing a gem’s appearance is to dye or stain it Microcrystalline and polycrystalline gem materials have a slightly porous surface which makes them suitable for this type of treatment Most dyes can be removed with the aid of a cotton swab moistened with a solvent such as acetone While most dyes can be removed by washing the gem in a suitable solvent, the bluish fluoride coating (as used on camera lenses) is more tenacious When it is found on a diamond’s pavilion it can only be removed by using an abrasive or by boiling in water Impregnation Some gem materials such as turquoise are legitimately impregnated with colourless paraffin wax to stabilize them and prevent attack from acid perspiration Colourless oils are also used to hide surface cracks, and coloured oil serves the double purpose of hiding surface flaws and improving the colour appearance of
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This note was uploaded on 10/11/2010 for the course ECONOMICS ECON 1B03 taught by Professor Holmes during the Fall '08 term at McMaster University.

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Chapter 14 Notes - Chapter 14 Gemstone Enhancement F oils,...

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