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茉莉精油30ml居然买成8.99$??!@!@

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07-11-02 05:57操作
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never heard jasmin oil can obtained by distillation. the aroma will be distroyed by the heat. I remember if the oil is extracted directly by commercial ethanol (a harsher process than the second method), then it is cheap, but good enough to be used in a burner; if it is absorbed first by plant oil like olive oil, then extracted by pure ethanol, it is considered safer,purer, more complete aroma, and of course more expensive. 

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07-11-04 21:24操作
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if it does not have strange smell, then it should be OK?

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07-11-05 00:51操作
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忘了提醒你也要注意皮肤的反应,如有过敏就别用了。

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07-11-13 22:03操作
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以下是引用frankincense在2007-11-2 7:06:00的发言:

It was never obtain by neither steam nor hydro distillation instead by sovlent forms concrete and saperated by alcohol under mild heat, derived jasmine absolute.

As such, burner pot will remain with layer of stain after burning.  Suggest dilute in jojoba, apply on wrist or behind the ears. 

[em15][em15]

distillation还分steam or hydro?

 

what's the difference? 望F大指点。

[em04]
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07-11-14 22:44操作
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以下是引用秋天来了在2007-11-14 21:29:00的发言:

不知道F大所说的steam 和 hydro distillation是不是分别为蒸汽蒸馏和水蒸馏?

忘记以前在哪本书上看到过蒸汽蒸馏和水蒸馏,刚才想找,可惜不记得是哪本书了,没翻到。不过倒是在网上找到了对这两种蒸馏法的描述:

蒸汽蒸馏:蒸氣蒸餾時,植物材料多放置在蒸餾器內的篩架上,藉由高壓蒸氣的通過,蘊藏在植物腺體中的精油同時被釋放出來,蒸散至水蒸氣中。當這種混合氣體沿著導管、進入冷卻系統後,蒸氣便冷凝回液體狀態,再依照比重與密度的差異,分離為精油與花水 ( Floral Water )。

水蒸馏:使用水蒸餾法時,植物原料則完全浸泡在水中,然後進行加熱。水的存在,可以避免精油的過熱、進而確保精油的品質。此方法使用的壓力和溫度都比較低,所以特別適用於橙花、玫瑰等對熱敏感精油。不過,由於水蒸餾的過程較緩慢,所以並不適合那些接觸熱水過久會受到破壞的精油,尤其是酯類含量高的精油脂(薰衣草等)。

明白了,多谢MM!
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