Greatest idea ever

Glass. Doesnt conduct electricity and is transparent.

First rule of the kitchen and the chemistry lab: hot glass and cold glass look exactly the same. I can see why no company would want to deal with the legal fallout of a thousand idiots burning themselves on the toaster because they "forgot it was hot".

My Chemistry teacher always said "Hot glass looks like cold glass!" every single time we did a lab. Drove me nuts, but now I say it when I'm cooking constantly.