Hi,
I recently bought an enamel-on-steel kettle to boil water (it is covered with black enamel on the inside). After i used it several times, i was cleaning the inside with a paper towel and i saw a lot of dark residue left on the paper towel. Is it normal? It seems like after i cleaned it the traces of that stuff disappeared but after i boiled the water again they reappeared. Should i be concerned that the enamel is dissolving into the water? or is it just something from the water itself?
Thanks Yev