Honey worked well for the already blonde highlights for me, but I've never had much brassiness to begin with. I didn't intend honey for that - I only wanted to try honey lightening, and it didn't lighten my hair, but it
brightened the highlights, made them look fresh from salon and much cooler. Maybe it's just because it helped remove some build-up well, I'm not sure.
I don't do honey treatments anymore, just because they are super-messy (drippy), but I think I'd recommend checking them out for already blonde or blonette hair. (Honey lightening thread with recipe and details:
http://forums.longhaircommunity.com/...read.php?t=148)
Purple/silver shampoos and conditioners can help with brassiness quite a bit, and if you need stronger effect, you can always use a toner (it's drying though).
Some people add deposit-only dyes (e.g. Manic Panic) to their conditioners in the opposite color on the color wheel to tone down the colors they want to tone down. And I've even heard of people adding food coloring to their conditioners (
http://forums.longhaircommunity.com/...t=6310&page=44), though I've never tried it myself and don't know how safe/effective it is.
Among plants, rosemary, amla, etc can temporarily slightly darken hair in a cooler tone.
Nightshade wrote a wonderful, detailed article on using herbs for changing hair color:
Hair Coloring with Herbs, Plants & Other Natural Ingredients -
http://archive.longhaircommunity.com...ad.php?t=51646
And whatever you try, strand-test first, to be safe.
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