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Q. Is it true that items which require the kashering method called “libun gamur” can be kashered by heating them with a welder’s torch for a few minutes?
A. In theory, libun gamur can be accomplished by using a torch to heat all surfaces until they are red-hot. However, in practice, libun gamur is quite difficult because if someone holds the torch in one spot at a time, the different parts of the metal will be at different temperatures and this will cause the metal to warp. Accordingly, the proper method of using a torch is to slowly heat up the entire utensil simultaneously by moving the torch around and around, and to continue this until each area is red hot. The whole exercise requires considerable expertise and patience, and is therefore only recommended for people with experience.