Try to use NSUSSER Default. Save that bookmark value into NSUSERDEfault and Then set the Blue image.
And check weather this value is present into NSUSerDefault if not then set the Black image. It's so easy...
Try this code
Create Defulat like this....
NSUserDefaults * BookMarkDefault=[NSUserDefaults standardUserDefaults];
Adding Value into Bookmanrk use this code once added that value then Set the blue image where you want to set.
[BookMarkDefault setObject:YoursavedData forKey:@"YourKey"];
imgview.image=[UIImage imageNamed:@"Blue.png"];
dont forget to Synchronize the Default...
[BoomMarkDefault Synchronize];
if you want to get that data from NSUSerDefault check out this
NSLog(@"%@",[BookMarkDefault objectForKey:@"YourKey"]);
Try this code....