Hmm I'm not sure.. my instinct would be to go over it all again, with a full coverage, but maybe someone who has actually used henndigo can help you. I haven't done it myself.
I do know you can store dye-released henna in the freezer for up to 6 months. I just did a second batch myself with frozen>thawed henna and it worked great. However indigo needs to be added fresh each time.
I'm sorry I'm unclear, are you saying that the newer growth was dyed darker by the henndigo, or is still lighter? I did read on the henndigo thread that it sometimes takes repeated applications to achieve the darker tone. Again my instinct would just be to do the whole thing over again.
I'm assuming you've read through the entirety of the
Show us your henndigoed hair! thread, you might be able to glean some relevant advice from that.
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