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<p>[QUOTE=&quot;ritzyvintage, post: 3461099, member: 18191&quot;]The opalescent glass produced at <i>Choisy-le-roi</i>, France was unarguably the finest of its period. Practically every known glass-working artist in France, used the facilities at some point in their career, including Rene Lalique and Sabino, who would both introduce their own recipe&#039;s for opalescent glass in later years.</p><p><br /></p><p>Opalescent glass uses varying amounts of Arsenic as an added ingredient which of course is highly toxic. The colour-type is also incredibly expensive &amp; labour intensive to produce, and only a small number of factories today still have a licence to produce it. </p><p><br /></p><p>The glass remains completely opaque milky-white in colour if it is allowed to cool without careful heat control and an exceptional degree of skilfully applied working procedures throughout each &amp; every stage of its manufacture. It is only once the glass has been allowed to cool gradually &amp; completely, will the opalescent qualities reveal themselves.</p><p><br /></p><p>&quot;True&quot; opalescent glass will display a range of colours (subject to different conditions of light ) from soft pastel-blues and subtle hints of purple &amp; pink combined with creamy-shades of white, however when the glass is lit from behind, hues of rich-golden amber can be observed... </p><p><br /></p><p>Shown below are a very fine pair of vases from my collection which illustrate some of the qualities of French opalescent glass. They were designed by Cesari, and produced at Coisy-le-roi, during the mid 1930s. </p><p style="text-align: center">[ATTACH=full]303360[/ATTACH]</p> <p style="text-align: center"><br /></p> <p style="text-align: center">[ATTACH=full]303361[/ATTACH]</p> <p style="text-align: center"><br /></p> <p style="text-align: center">[ATTACH=full]303362[/ATTACH]</p> <p style="text-align: center">&nbsp;&nbsp; </p><p>[/QUOTE]</p><p><br /></p>

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