Translation of "Scum" in Japanese

4. Just before bringing it to the boil, set to a low flame and remove the scum again.

４．煮え立たせる寸前で弱火にして、もう一度灰汁を取り除きます。

When the scum stops appearing pour the syrup back into a clean bottle and keep it in the fridge.

アクが出なくなったら清潔な瓶にシロップを戻し冷蔵庫で保存します。