I summarized the original thread including tips, broke down the original dilution used, and the thread with all reports is linked here, http://ktanihairsense.blogspot.com/2...vation-by.html.
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The short answer is no, it can be left-in, rinsed out lightly or rinsed out well.
The colour of the hair does not matter. The original rinse, which is much more diluted, has not been reported to cause photosensitivity or lighten hair. Other, stronger dilutions may do both if left-in. Because the original recipe is an estimate (5 to 6 litres of tap water), more water can be added to the breakdown I gave, based on 5 litres.
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