White with black monogram yellowing issues

[LVLuxury]

I'm a huge fan of this style. My Wynwood and my Spring Street now have yellowing to them. Both are on the bottom near the seam. I bought both second hand, so I can't comment if it was in heat or something happened. Has anyone had this issue with white canvas and black monogram?

 

[fancyfloragurl]

it is said the damier azur does the same thing. It is Navy and white checkered. Over time it can yellow. I think the black and white may do the same. Perhaps something about the white showing it all.