Many a time I have bought a baked beauty product used it for a couple of weeks to find that it has lost all it’s pigmentation. This can happen to any product that is baked; blush or eyeshadows as the natural oils from our face is then transferred on the brush/fingers and then the product.
These oils cause the top layer of the product to seal over time. In order to re-release the pigmentation you simply need to scrap of some of the top layer, I personally just use a clean (sterilized) pair of scissors to score into it.
Such a simple quick trick to save your baked products!