CA/BLO finish.

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Ian, when I first tried the CA/BLO method, I didn't know the differance between Boiled Linseed Oil and Raw Linseed Oil.
Although I have struggled with both and get variable results with both, I can't say there has been any differance between them. When I made a post about using RLO Russ Fairfield said that it should work fine. I still use it now and again. I now think my problem is/was using too much of both as my best results have been when I've used them sparingly. [:I]
 
Hi Steven, Thanks for your reply.[:)] You've drawn me right into this - hook line and sinker[:I] - apart from the obvious, what is the difference between raw and boiled. Does boiling alter linseed oil chemically? Does it make it easier to use? Is it clearer? I'm in a fog here and would like some help!!! [?] Can anyone else add to this?
By the way, I received your email and am now awaiting replies from a couple of more prospects, but will let you know as soon as the order is placed.
Ian
 
http://www.penturners.org/forum/topic.asp?TOPIC_ID=19496&SearchTerms=raw,linseed

Ian, here is a link to my question from a while back. Hope it helps as there were some good replies.
 
While I cannot provide you the exact chemical differences between raw and boiled linseed oil, there is a chemical difference. The primary difference is the drying time in BLO is altered (shortened) via chemical additives.

And boiling is a misnomer. It is not actually boiled. I remember reading a long time ago that one of the original methods of altering the drying tinme of raw linseed oil was to inject nitrogen gas into the vats of the raw linseed oil. Workers misinterpretted the bubbling action as boiling, thus the term 'boiled' as applied to the product. Whether that is urban legend or not is up to debate. Makes for a good story tho.

And, for all you science geeks and non-geeks alike, the question I use to test the quality my kid's science teachers and their education is: Did you know that you can boil water until it freezes? If you can understand that and correctly answer why, then I know you understand the true principle of boiling and what actions can effect or affect the process.
 
From my understanding "Boiled" is actually put through a process whereby the moisture content of the Linseed Oil is greatly reduced. That should possibly explain why the BLO does not have the 'white' glaze that develops when it is often used with the CA. CA and moisture are not compatible and the results are disastrous to finishing. [:D]
 
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