iron oxides and irradiation

Good day dear chemists. 
I have a question in regards to iron oxides and minerals. We usually send them for irradiation before using them either in masks or loose or compact powders. 
My question is about lipsticks(anhydrous) , should i do the same and send the minerals for irradiation, or since the process involves heating , i don't need to do this
Thanks in advance
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