Andy M.
Certified Pretend Chef
Just checked my manual actually it doesn't scratch but could leave permanent aluminum marks.It says also to clean metal marks from aluminum or copper pans before heating cook top again or they may not come off. The manual also says to remove sugar spills and soils from jellies and candy syrups as soon as possible as it can cause pitting on the glass.Dont know about anyone else but I read my manuals and keep them all together in a large drawer whether its a large appliance or an alarm clock I can find the manual.
That makes more sense. I did not know heat would set the marks. That's interesting.
I also read and keep manuals handy.