Before the invention of the refrigerator, people around the world were looking for their own ways to preserve food. One of them is marsh oil, which was used by the ancient Celts and their ancestors. Dublin scientists recently confirmed two facts: it is indeed cow's milk butter and is over 3, 500 years old.
There are about 430 known caches of bog oil, of which 274 are located in the geographically close territories of Scotland and Ireland. Usually this is a container, a wooden tub or an internal organ of a large animal, in which oil was placed. Then the vessel was hidden in the peat bogs. This is both preservation and processing - in 1995 it was proved that the level of pathogens in such a product is not higher than that of an analogue in a freezer.
At the 2012 Oxford Symposium, modern versions of bog oil were presented. It turned out that the product absorbed the smells and tastes of the environment and became somewhat similar to blue cheese - some were delighted with the "piquant notes", others could not even dare to try it. But the oil remained oil, did not turn rancid after several months in the swamp, and it was successfully used for food. As a delicacy, by analogy with a product from the diet of the indigenous peoples of North America, with a similar production technology.
Scientists call the Irish bogs a "unique chemistry" environment. Their ability to preserve organic matter is impressive, with carbon analysis showing that some oil samples were hidden in a swamp around 1700 BC. And this is not animal fat, judging by the analysis data, but a dairy product, which gives new ideas about the level of development of people in these parts in those distant times.