LIBROS DEL AUTOR: thanuja raveendrasinghe

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  • A heat treatment method to convert deguna stones to padparadscha
    Thanuja Raveendrasinghe
    As a traditional heat treatment practice, red and blue combined deguna stones are converted to pink sapphire or ruby around 1,200 degrees of Celsius under oxidizing ambient air state inside the Lakmini furnace. Under these conditions, already available red tone due to chromium (III) ions is highlighted since fading of blue colour occurs because of the dissociation of ferro - ti...
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    81,28 €