Ages ago women (and men, I assume!) used nature to enhance their looks and take care of their bodies.
Here are some simple recipes for your hair. These are rinses so you don't wash them out. Take the herb and steep on low heat for 30-45 minutes. Then let them sit and cool off in a covered pot. As far as ratios goes :)....you know my methods are unmeasured :), but here are some basics.
One handful of herbs to one quart of water.
We just cracked lots of walnuts, so I saved the shells. No ratio, just lots of shells in water.
Brown hair = Walnut shells or sage
Red hair = hibiscus flowers
Blond hair = chamomille
Once you concoction cools, you can use the rinse straight on your hair after shampooing. Do not rinse. You can save leftovers in the fridge, but I would use within a week.