PArt of the difference is temperature
Posted by Kim in MI on September 10, 2004 at 11:12:26:
In reply to: Question from a beginner posted by Whitney on September 8, 2004 at 19:06:57:
The 12 hours is at room temperature, mixed with lemon juice - the acidity helps thedye release.
With the store instructions they use HOT water to accomplish a faster dye release ...
Here's a chart that shows how the dye is released faster at longer temperatures.
I get a decent coloring with only around 2 hours on my head. The longer you leave it
on, the longer it can penetrate and you get a deeper, richer color. Some of the store
brands, even all-herbal ones, rely on other non-henna herbs to get some of the color
variation.
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