Wellness Indoor question

I have a question for anyone who feeds Wellness Indoor Health (or any dry Wellness for that matter). Do you notice color/appearance changes from bag to bag? When I first started using Wellness, the food was light with a few dark splotches here and there. A few bags latter and it was a darker, more uniform color. Now I opened a new bag and it's a lighter more uniform color. I was just wondering if this is normal, and what could possibly cause the variations?

Thanks in advance!

My sister used the indoor for some time, then switched to weight control. She said she thought it was just natural variances. Her cats still eat it fine and have no problems.

littleraven,
Thanks for the reply. My cats are doing fine on the food, I'd just always wondered about the varience in appearance.

I will drop the wellness rep on here a pm ... slight varience is normal but should not really be all that noticeable