I inherited this beautiful old tetsubin which I have used for several years for boiling water on the stovetop. As happens, it developed rust and over the past few weeks I tried several of the techniques described here and on other tetsubin forums; vinegar to dissolve, baking soda to scrub, old tea leaves to blacken. Results were mediocre so I tried another approach I had read about - letting it sit for a few hours with Coca Cola. Big mistake. The blueish coating receded considerably and now I have a great deal more exposed and rusting iron than before. It’s now at the point where I can no longer use it. Just too much rust. So now what ? Hoping someone here can guide me in the right direction. Is it possible to restore the blueish coating whatever that is? Can I have it refurbished professionally ? Any other suggestions welcome. I value this tetsubin greatly and would like to be able to continue using it on a daily basis.
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