Particles are irregularly shaped and may be part of some type of metal coating or simply poor quality material to withstand the heat of the burner. I hope they are not dangerous as we have been using the kettle for a week now. I have a standard electric range (nothing extreme or professional level) and a good kettle should be able to handle it. To return. Disappointed because I like the design. For $35 you get a solid product :(Also keep in mind that the handle to open the neck of the kettle only works one way. If you release it, the neck stays open. You can forget to physically close the lid and. put the kettle back on the stove, not realizing that the whistle will never go out.
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