That is so weird. I wonder what's up. I guess there truly is variation between batches of cases. The silver is standard anodized, not colored in any way, so that might explain that, but I know they finally changed the gold to darker than my 5S.
I'll have to take a picture of the 5S next to my 6 Plus. And yes, the white front on iPhone is much better than black. Gives it a nice touch.
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