Unsalted butter semi-salted and salted butter

Unsalted butter is obtained simply by churning the cream. It can then be mixed with a precise amount of salt to create semi-salted and salted butter. As such, salted butter contains at least 3% salt, while semi-salted butter must contain between 0.5 and 3% salt. If it is usually salted with fine salt, it can also be salted with salt crystals, to give it a slightly crunchy texture.