You've seen these.
Mostly in the coating department.
Some products have them in every batch.
With other products you never see them.
And usually, only a few.
And equipment vendors guess because they also don't know.
Know why? Because this is not an equipment problem, its not a process parameter and its not a coating problem. Its not even a compressing problem.
It is an interaction between certain APIs and the storage conditions between tablet compressing and the coating/packing departments.
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Solid Dosage Training, Inc.