Rust on urushi spot outside at the bottom of my new tetsubin
I bought a Kunzan tet from Hojo about 3 months ago and I just find out that the bottom part on the outside is rusting, on the urushi.
Is that normal? I ise water from the faucet that I leave in the refrigirator with a binchotan.
I heat up my tet with a electric heated plate.
Any help would be appreciated.
Thank you!