Because my granny gave me a round stone she said she'd had for like twenty years. And this thing was black! I mean dark as night, no amount of scraping or scrubbing would change it black.
So I've had said stone for about ten years. And it is still black.
That is until recently.
So I keep this stone in the oven for easy access. Well I hadn't cleaned my oven, or my house for that matter, in a long time.
I have a self cleaning oven...I figure WTH.
I'll set it and then at least that will be clean. So I do all the button pushing, the oven door locks, I go upstairs to take a shower.
Well an hour later the house is all smoking, the detectors are silent (at least we learned that) and the oven is locked. I open up the windows and start the fans. Hours later we find out that the oven wasn't that dirty. The Pampered Chef Stone was!
And now my stone is as good as new looking. Crazy huh!