Enamel utensils are made of metal and coated with a thin layer of enamel for aesthetic reasons. The inside of the pot is usually colored white, while the outside is decorated with different colors. Enamel is made of sand like glassware, but it is processed differently. Great uncertainty arose regarding such utensils. At first, poskim were uncertain because the craftsmen kept enamel’s composition secret. Then, when it became known that enamel is made of sand, uncertainly arose again as to whether such utensils have the status of earthenware.
In practice, the poskim rule that one may perform hagala on enamel utensils like all other metal utensils, and some recommend performing hagala three times. Yet regarding Pesaĥ, some instruct not to perform hagala on enamel utensils in light of the severity of the ĥametz prohibition.
. Responsa Ĥatam Sofer YD113 states that enamel is koshered via light libun. R. Shlomo Kluger rules stringently that one may not kosher enamel even via libun, since it might get damaged in the process (Tuv Ta’am Va-da’at, first edition §183). Ktav Sofer YD 78 permits koshering enamel via triple hagala. SHT 451:191 quotes Ĥatam Sofer and then states that many great authorities were more stringent in this matter when it came to Pesaĥ. This is also the view of Maharsham 1:53. Aderet rules that one may kosher such utensils via hagala, but out of respect for Ĥatam Sofer states that one should use triple hagala (which according to Itur works even for earthenware vessels once twenty-four hours have elapsed since they were last used). This is also the opinion of AHS YD121:27. R. Mordechai Eliyahu states that one may kosher these utensils for Pesaĥ via hagala, and preferably triple hagala.