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