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Rhodium plating strenght

Hi Orchidians, How can one possibly identify that the Rhodium Plating
Bath is not up to that level (strength) that it was when one has
started it? Is there a convenient and practical way to identify its
strength (density) please, any help? I am noticing that its bath is
not that brilliant as it used to be after one and a half years using
it. JT Malta