why do shinny aluminum pie plates turn dull and dark grey in a dishwasher.

Question

Even on low heat. What exactly is the reaction?

In: 6

Answer 1

aluminum can be etched with many different chemicals. commercial fishing boats are acid etched to remove the shiny coating. they quickly dull to a grey colour and once grey will not change much further unless it’s scratched.

it’s not the temperature, it’s the dishwasher detergent that’s stripping the aluminum.

if it’s shiny aluminum or anodized, don’t send it through the dishwasher.