Mixer homogeneity test

Dear all,
I would like to test double peddle mixer homogeneity in shrimp feed industry to ensure all ingredients are mixed properly in order to give homogenise mash.
Please some one help me how can i do particular test?
i tried with known salt concentration before which did not give me satisfactory results.
Then i tried to start with magnetic powder testing but i am not clear which type of magnetic powder to be used in this particular industry
please advise
thank you all
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