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I use Tung Oil on wooden trays that I export to China. But those trays are not used for food. (if you do use Tung oil for other non food contact woodwork, dilute it with Citrus Terpene which is made from citrus peel. Allows better penetration of the oil into the timber.)
I would avoid the Tung Oil due to it being pressed from the nut of the Tung tree. Hence the chance of the Tung Oil transferring to the food that is prepared onto the board and an allergic reaction happening. It's only a very slight chance, but better safe than sorry when it comes to nut allergies.
Regards,
Shane.
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