Dye hair with tea...?

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I have dark blonde hair with some warm undertones. I would like to get slightly warmer hair, without harsh dyes.
Has anyone here dyed their hair with tea? And more specifically to add red tones? What type of tea did you use and what were the results?
I've read that rooibos tea enhances red, but I'm afraid of turning my hair orange. 
Any tips would be greatly appreciated!