Nothing nice and NOT cute to behold
I forgot about something: my wretched henna/condish/pectin/gelatin concoction initially came out looking too light and the next day I reapplied the rest of the batch to my hair, to keep in for another 4 hours. So basically I protein overdosed my hair twice in 2 days
Phew, that's brutal. I definitely think I was almost to that point myself. As for what might better darken your gray roots: what about adding just a touch
of indigo to your mix (only applying it to the roots), making sure to strand test it to get a reasonable color from it?