Found iron particles in mebendazole

During sifting of mebendazolw in my industry we have found iron particles then we have gone for sifting of mebendazole through magnetic grill and again observes same. I have search synthesis of that but still jo found any iron precursor or chemic in the syn. Of that.
So my que is why iron particles are presence in mebendazole?

Contact the material vendor for the same.

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