murky brown and green. true alchemy.
"true alchemy" is based off of IRL potion making, also known in the modern day as tinctures. It's kind of like tea, except instead of water you use some of the strongest alcohol you can possibly get your hands on, and you let it 'steep' for 3 months instead of 3 minutes.
The color of Tinctures is actually varying colors of amber, essentially corresponding to the color of medium or dark beer.
If it's any other color than that, it either means you got ahold of some bad ingredients, usually with some kind of fungus, and also had alcohol that was too weak to counter this, the infusion bag ruptured while you were making it, or you otherwise added something that shouldn't normally be in there.
(Yes, I've made tinctures before. They can actually taste pretty good if you make them with 98% grain alcohol.)