I have dark blonde hair, and have used chamomile shampoos off and on for 8 years or so. I'm not really convinced that they lighten my hair at all. What say you?
For the record, I used:
Aubrey Organics Blue Chamomile (for at least two or three years)
Aubrey Organics Chamomile Luxurious (also for at least two or three years)
Chagrin Valley Soap Chamomile & Citrus Shampoo Bar (for a couple months now)
I've tried chamomile tea a few times too, but I haven't seen enough results to make it a habit.
A reference picture of my hair:
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