Now I spoke to my wife, if it is normal that their Lumia is yellow instead of white. In fact, the shell gilbt with time and it looks really no longer beautiful. We have disposed of the shell and look around for another device protection.
When I look at the envelope on my iPad, I also see a slight yellowish coloration, although not noticeable as a result of the dark hue.
Otherwise we were very pleased by the fit, the low weight and the feel for the price. Of course, wearing a "shell" on how do we go then?
I can not recommend the white transparent shell for light housing and forgiving despite the otherwise good properties only 3 stars because we had to dispose of them ultimately.
Update 03/15/2015
Mumbi had informed shortly after my review me via email that there were faulty deliveries. I was then a short time later a new envelope sent free of charge. Unfortunately, too late, as my wife what has procured new and the shell no longer wanted to use.
I find the response from the producers very well. It shows that he really pays attention to the opinions of its customers and responds. Unfortunately for me nothing has changed because there is already another replacement has been procured. But alone for the reaction I want to place an additional virtual star. And with new purchases i will also like again consider and buy the products from Mumbi. In my iPads gray cases are properly and fulfill its purpose for little money.
Update 02/05/2015
We now have the new shell but used now and will not become yellow! Apparently it was actually a faulty batch or she would not fit with the unfathomable contents of a lady's bag. ;-)
I raise to 5 star and can still recommend the product.