I bought a small hand-held water heating coil,
the type designed to heat water in a cup to make coffee tea, etc.
It is supposedly from China.
After a few uses, a white powdery residue built up on the coils themselves. One the coil and a little above the water line but not all the way up to the handle, i.e, not completely covering the metal part. Therefore I think contact with the water has something to do with the formation.
The coils in their clean state look to be stainless steel.
There is a plastic handle and the unit plugs into the wall socket.
This white residue will come off on my fingers
I am using Nestle brand drinking water to make coffee, not tap water. The cup is completely washed before each use, so there is no residue from coffee, creamer, sugar etc.
Does anyone know what chemical this residue would be, and if it is harmful?