How strong are iPad's aluminum?

[Kal-037]

Not being OCD, just curious as i have a silver iPad and have had a few color variations since they came out, I was curious how strong the aluminum finish is, for instance I got a new iPP and the back came with some of marks (not scratches just strange marks like it had tape on it for moths then removed,) I used one of those Black Zagg microfiber cloths with water to clean it the best I could, (rubbing it quite a lot, but one mark is there ever so slightly.) Is the aluminum strong enough for me to have rubbed it a bit to remove the strange manufacturing marks?
Just curious if I need to worry about wearing off the silver color, and if I should only use those fluffy microfiber cloths when cleaning the iPad.
Danke.


Kallum.

 

[RudySnow]

From my understanding, the pigments are built into the aluminum alloy, so it's not possible to rub any color off. I regularly clean the front and back of my iPads and iPhones and have never had cosmetic issues.

 

[Cordorb]

https://www.engadget.com/2012/05/29/how-anodizing-aluminum-finishes-apples-products/