"Liquid Light" - I used to use this quite a bit back in grad school. During that time they changed the formula and I grew very frustrated with it, as I had worked out a very specific workflow to "age" it. "Ageing" it gave me very consistent results. I called the company at the time, and they did tell me that the formula was changed, but only after some explaining on my part.
It can be fun to use, but the consistency of result wasn't there for me anymore.
If you had some specific questions, I would be happy to answer as best as I can.