How to tell good from bad chia seeds

The top photo below is a good example of poor quality chia. Chia seeds are either black or white. Look closely, you will see many brown chia seeds. These are immature seeds and have lower oil, protein, omega3 etc. contents. Additionally there are weed seeds and plant parts in the photo.

If you want to see what clean, good quality chia is like, look at the photo below:

Here are photos of what some people are selling.