noun
refined salt
Refers to salt that has been processed to remove impurities, typically used in cooking and food production.
このレシピには精製塩を使うとよい。
It's good to use refined salt for this recipe.
天然塩 is natural, unrefined salt, contrasting with 精製塩 which is processed.
Compound of 精製 (refining) and 塩 (salt).