My blush brush is supposed to be white on the ends. They might need to be cleaned just a bit.
Pour equal parts of dish washing liquid and olive oil in a plate.
Swirl the brush in circles to combine the oil and soap. The soap will clean the brush and the oil will keep the brush from drying out.
Rinse the brush under cold water facing down. Try to keep the water on the brush hair only. If water gets into the handle of the brush, it could mold.
After thoroughly rinsing the brushes, allow them to dry for 24 hours.
They look good as new.
Do you clean your make-up brushes on a regular schedule?