Dear friends: Please bear with me. I keep thinking about different suggestions as new mail arrives regarding the use of mineral oil. This is a term mostly used in the Americas. In Europe (I should have remembered) mineral oil is known as paraffin oil. It is the same thing. In North America, mineral oil approved for sale as veterinary medication should be appropriate. Thanks to those of you who keep providing me with input on this subject and to those of you whom I know will do in the future. As beekeepers, we must stay together in the fight against the terrible plague that bee mites age getting to be. Happy beekeeping. Best regards. Dr. Rodriguez