Flaxseed oil has a normal smell and foam after heating. Flaxseed oil contains a lot of α -linolenic acid, which is the same as deep-sea fish oil, and the α -linolenic acid content of flaxseed oil is higher than that of deep-sea fish oil, so it will smell fishy after heating. Because linseed oil has higher water content than other vegetable oils, it will produce foam after heating. You can see that linseed oil has a normal smell and foam after heating. Linseed oil, also known as linseed oil, linseed oil and linseed oil, is a fatty oil extracted from mature seeds of flax or both, which is used in millet. Flax can be divided into fiber flax, oil flax and dual-purpose flax according to different uses. The oil is yellow, clear and has a special flax smell. Linseed is mainly produced in northwest China and Inner Mongolia.