Original sentence: Ingestion of 10 ml can cause blindness and 60-100 ml can be fatal if the condition is untreated..  Like many volatile chemicals, methanol does not have to be swallowed to be dangerous since the liquid can be absorbed through the skin, and the vapors through the lungs.Methanol is safer when blended with ethanol.Methanol occurs naturally in the human body and in some fruits, however it is poisonous in sufficient quantity
Edited sentence: Methanol is poisonous; ingestion of only 10 ml can cause blindness and 60-100 ml can be fatal,  and it doesn't have to be swallowed to be dangerous since the liquid can be absorbed through the skin, and the vapors through the lungs