The new Dr. Bronner's 18-in-1 Hemp PEPPERMINT PURE-CASTILE SOAP I got doesn't look like the old stuff. I have the last little bit of a bottle my mom gave me about 3 years ago, and the color is totally different. Here are some photos:
Notice how much darker the old sample is than the new sample? (I poured it onto a white plate for the photo-op.) Here are some closeups, first old:
The new stuff looks practically like water compared to the old. Which could be the answer; maybe they've sold out and started watering down their soaps to keep up with the competition from all the fakers. It also could be that something in the soap gets dark over time. Another possibility is that they've just altered the formula slightly---which is certainly true, because the ingredients are different, though not by much.
Old ingredients: Water, Saponified Coconut-Hemp-Olive Oils (with retained Glycerin), Olive Fatty Acids, Peppermint Oil, Rosemary Extract
New ingredients: Water, Saponified Organic Coconut* & Organic Olive* Oils (w/ Retained Glycerin), Organic Hemp Oil, Organic Jojoba Oil, Organic Peppermint Oil, Mentha Arvensis Extract, Citric Acid, Vitamin E
(The asterisks indicate which ingredients are "Certified Fair Trade", which by the way seems a little disingenuous considering the comments by David Bronner in the interview above, and the fact that the new label prominently displays "CERTIFIED FAIR TRADE").
Another dubious piece of evidence: the hole in the lid grew significantly from old to new, as if to say "use more!".
WE'RE WATCHING YOU, DR BRONNER! DON'T DILUTE! DILUTE! OUR SOAP! OK! OK!