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Swirt, it is you are mistaken, and not, regarding converting flax seed oil to boiled linseed oil [BLO].
The pre-polymerization process was first done and is yet done by blowing air through vats of flax seed oil. The oxygen in the air, about 21%, reacts with the flax seed to make BLO. It was heated too, but the air blown through it made it look like the oil was boiling, thus the name BLO.
The process of using air to pre-polymerize oil, like many things, depends on art, in addition to routines and ratios. Too much air and a batch can be lost. If the oil was allowed to boil, the batch would have been ruined by too much heat.
It was after it was discovered flax seed could be pre-polymerized, to speed up hardening, by blowing air through it, it was learned adding certain heavy metals to it would, also, speed the process. Again, too much can destroy the product to which it is added.
Not all BLO has heavy metals, though it has become more common. Again, the boiled part of the name came from blowing air through the oil. It did not come from adding heavy metals.
The end result, whether by blowing oxygen through the flax seed oil, by adding heavy metals to the oil, or by doing both would be the same - hardened flax seed oil, in time.
As to the pre-polymerized Tung oil I bought, it is presumptuous to insist it had heavy metals when you were told it did not. Such presupposes I didn't know about the product I was using, and the processor was less knowledgeable on the matter than you, or lying.
As I said before, I bought pure Tung oil the company pre-polymerized. Just as is done with BLO using other than chemical additives. It hardened quicker than pure, raw Tung oil, and quicker yet, once I applied the heavy metal additives to the product.
The pre-polymerization process was first done and is yet done by blowing air through vats of flax seed oil. The oxygen in the air, about 21%, reacts with the flax seed to make BLO. It was heated too, but the air blown through it made it look like the oil was boiling, thus the name BLO.
The process of using air to pre-polymerize oil, like many things, depends on art, in addition to routines and ratios. Too much air and a batch can be lost. If the oil was allowed to boil, the batch would have been ruined by too much heat.
It was after it was discovered flax seed could be pre-polymerized, to speed up hardening, by blowing air through it, it was learned adding certain heavy metals to it would, also, speed the process. Again, too much can destroy the product to which it is added.
Not all BLO has heavy metals, though it has become more common. Again, the boiled part of the name came from blowing air through the oil. It did not come from adding heavy metals.
The end result, whether by blowing oxygen through the flax seed oil, by adding heavy metals to the oil, or by doing both would be the same - hardened flax seed oil, in time.
As to the pre-polymerized Tung oil I bought, it is presumptuous to insist it had heavy metals when you were told it did not. Such presupposes I didn't know about the product I was using, and the processor was less knowledgeable on the matter than you, or lying.
As I said before, I bought pure Tung oil the company pre-polymerized. Just as is done with BLO using other than chemical additives. It hardened quicker than pure, raw Tung oil, and quicker yet, once I applied the heavy metal additives to the product.
