Hummm no idea. But I'm having deja vu - maybe I read this before - or said this before. I'm not for flavored teas, but if you must or you really enjoy the fragrance of them, I find it is better to add the flowers rather than buying flavored.
I found this article on how to make Violet Tea:
I especially liked the warnings.
Re: Tea Noir - 4oz is a lot of tea, I'd just write to the maker and request a sample.