Space Gray iPhone 5S Touch ID Ring does not match!

[Gav2k]

It's been a long time since I was in school but I seem to remember steel can't be anodised!?!

 

[Mollerade]

Now we know

It's been a long time since I was in school but I seem to remember steel can't be anodised!?!

Quick lookup in the "Interwebs" and i think you have it.. looks like steel rusts when anodised.

Maybe Apple Designers designed it to be the same as the aluminium bevel but Apple Hardware told them about something called physics.

 

[Gav2k]

They must have used a stainless blend of some sort