I think the residue is just minerals in your water. I get the same thing in
my stainless steel tea kettle.

Rina


> wrote in message
...
> 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