Actually, the wooden chopping block is non-toxic. The really toxic substance is cycad. The seeds and tree hearts of Cycas are poisonous. Generally speaking, ironwood is not directly used to make chopping boards. In fact, the real material used in Tiemu color plate is Hoya wood, which is non-toxic. However, it is normal that some ironwood chopping boards I just bought will taste sour. This is the original flavor of the tree. Before use, you can soak the ironwood chopping board, and you can use rice washing water. After soaking, the taste will naturally dissipate. You should know how to tell the true from the false when buying an iron wood chopping block. Some inferior wooden chopping boards always add some chemical reagents when they are made.