First you can't purchase chroma for glimmer they are for silver dust, second Bungie has already said treasures of the dawning will persist even after the event is over.
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Oh, I'll fix that. When did bungie say they would stay?
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They said it in the patch notes, but clarified again on twitter: https://twitter.com/bungie/status/808759674723962880
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Alright, well thanks for clarifying. I had never seen this until now.