Thanks for your reply!
I'm going to buy the same one you've used, to be sure to not have bad surprises.
Anyway just for reference, on the Dictum website you can find two types of Linseed oil:
Linoja (the one you use), its decription says:
Especially bright and colour-fast. Pre-oxidation makes this oil dry much faster and slightly bleached.
Ra Linolja its descriprion says:
Untreated linseed oil, a pure natural product, dries slowly so penetrates deep into the wood, polishes well.
Because of these differentiation I tought that the first was the cooked one and could be compared to the cheap industrial I had found on amazon.
But thanks to your hints I have done some further research and turned out, expecially from
here that yes, pre-oxidation is a sort of heating process and hence the Linoja product is a bit cooked compared to the Ra Linoja. The cheap industrial products instead are not actually cooked, as written in the link above and also in the link you have written before:
Hardware stores sell cans of “boiled linseed oil” but the oil is not in fact boiled or pre-oxidized. Instead it contains metallic drying agents that speed oxidation. There are small amounts of metal salts in most linseed paints. These are heavy metals (including cobalt, manganese and zirconium) that may be problematic for human health.
So for sure will be worth to go with the Linoja Organic Swedish Linseed Oil, despite the higher cost.
Hope this can be helpful also for some other.
Regards,
Gianluca