Question about Nicrosil compounding and other types of investiture
From what I understand about Compounding, what you're doing is just making Preservation/Harmony fuel your feruchemy for you.
You store a unit of an attribute in your metalmind and then burn it, the metal being a key that let's Preservation/Harmony's power flow through the metal which carries your attribute and so the power takes on the properties of that attribute.
But that seems to create a problem for Nicrosil if you're storing alien investiture. You store a unit of stormlight in a Nicrosilmind. But that's another shard's power, so what's happening when you compound it?
Is Preservation/Harmony having some of it's power permanently transfered to Honor? Or do you now have one unit of Stormlight and 19+ units of "Preservation's power acting like stormlight."
Am I missing something obvious here?