NARs blush itself is good, but the case is always turn into sticky.
You can depot (I.e. remove the sticky outer case) and keep the blush pan in a magnetic makeup palette There are plenty of tutorials online. Or, you may try removing the black sticky stuff by rubbing it with a solvent e.g. alcohol. Applying a layer of silicon-based loose powder on the NARS case is said to be able to mask the stickiness temporarily.