Guest guest Posted August 12, 2004 Report Share Posted August 12, 2004 Hi all, For the reasons I outlined before concerning oxidation and resinification, my preference is to store oils at 1-2 degrees Centigrade. If you are asking me if chilling produces irreversible changes to essential oils, then the answer is yes, for a few oils. As I indicated before, many true and false cedarwood oils deposit sesquiterpene alcohols (including cedrols) which may not susequently redisssolve on warming. Stockists of authentic Virginian Cedarwood etc. frequently build in high losses to compensate for this (or separate cedrol as a by-product and sell it). Since most US produced cedarwood oils are cut with Chinese cedarwood oil to lower the price, and which only has a low cedrol content (8-14%), this deposition phenomenon may be observed more rarely these days, for the very worst of reasons. I have also notice irreversible deposition of solids/crystals following refrigeration, which does not go up with subsequent warming with the following materials: blue cypress oil, naouli oil, the waxes depositing from many citrus oils, the waxes depositing from blue chamomile oil (major deposition), hydrocarbons depositing from the essential oil of St. s wort, some grades of tonka. The fact is that in the perfumery trade, when perfume compounds are sent off to be dissolved in various strengths of ethanol, according to the class of perfume to be made, this is the point where we see loss of components. For example those companies at the cheap end of the market, employing lower strength grades of ethanol - say 68 -70%, comparable with some grades of vodka, will see for example the sesquiterpene hydrocarbons of ylang ylang coming out, and resinoids like benzoin not being entirely soluble on chilling and filtering. These same companies often complain that the perfume smells different before and after filtration. Employing a higher strength of ethanol will help reverse this phenomena to some/or a great, extent, and really if you are using valuable materials you should be using 90% plus ethanol to do justice to your perfume and to fully bring out the potential of the components. Tony www.tonyburfield.co.uk <http://www.tonyburfield.co.uk> Quote Link to comment Share on other sites More sharing options...
Guest guest Posted August 12, 2004 Report Share Posted August 12, 2004 On Thu, 12 Aug 2004 09:55:25 +0100, you wrote: > For the reasons I outlined before concerning oxidation and > resinification, my preference is to store oils at 1-2 degrees > Centigrade. If you are asking me if chilling produces irreversible > changes to essential oils, then the answer is yes, for a few oils. Agreed. As mentioned before, in a cool environment, with as little temperature variation. Freeze/thaw does damage some product. So actually going to freezing point or below is not a good idea. It is also used as a stability test for finished products. For those who do not know, the test is used to confirm stability in real life when products in a truck or train are subjected to adverse environmental temperature. FWIW, we use to keep our lab fridge at about 5C with the alarm set at 3C. No statistical reason, just safe for storage of items used daily. I seem to recall the bulk room was set at about 8C. Again, I do not think there was any rationale, just a setting. It however appeared to work. These were for 250-10 kg containers. -= ß =- _______________________________________________________ Quote Link to comment Share on other sites More sharing options...
Guest guest Posted July 3, 2012 Report Share Posted July 3, 2012 Gretchen, I simply strained them off, then put them in a small baggie, flattened out the air, sealed and put them in a second bag. I wrote the date on the outer bag. I just mimicked how I received my grains by mail the first time - so simple. I am really glad I had a stash! Best wishes, LaDonna Quote Link to comment Share on other sites More sharing options...
Guest guest Posted July 3, 2012 Report Share Posted July 3, 2012 Thanks LaDonna! In a message dated 7/3/2012 6:08:17 P.M. Eastern Daylight Time, jandlharris@... writes: Gretchen, I simply strained them off, then put them in a small baggie, flattened out the air, sealed and put them in a second bag. I wrote the date on the outer bag. I just mimicked how I received my grains by mail the first time - so simple. I am really glad I had a stash! Best wishes, LaDonna [Non-text portions of this message have been removed] Quote Link to comment Share on other sites More sharing options...
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