Like Wrath, Elayne also took a sample of the dark water for experimentation purposes (she got hers from the baths with the spooky mirror). Would trying to do the magical equivalent of pushing it through a coffee filter over and over again to "purify" it have any effect?

Also, if she pulled apart her pendant, would she be able to figure out its inner workings? And would she be able to put it back together and make it work again lol