Bumping to share my experience:
I tried it last saturday. I used bigen black (number 58 if I remember correctly).
When I went to the BSS I only got two bottles because I hadn't taken enough money with me
. I figured it would be enough even if I have past BSL hair.
When I mixed my "batch", I understood right away it wouldn't be enough. So i just figured I would add more water than they recommend on the box. I managed to make a whole bowl with two little bottles !!! And still...it wasn't enough to do my whole head.
I had made 4 sections, and when I started working on the last one, I was scoopin' and scoopin' for the very last drops
.
It worked VERY WELL ladies. The color is great and I did not experience anything bad so far.
So you can dilute your bigen: just make sure it's not too liquidy. It must not drip on your face. It must remain a paste, but you can use much more water than they say