Hydrosols represent the "second act" in the distillation drama. When we heat up plant material, its volatile components are released—some are fat-soluble, or lipophilic, while others are water-soluble, or hydrophilic. Essential oils, for instance, are more inclined to dissolve in fats, which is why they're perfect for concocting massage oils or even flavoring your favorite gelato. Now, essential oils don't typically mix well with water, although it's a bit nuanced. Some are denser and sink, others are lighter and float, and a few are ambivalent, forming a quasi-solution with water. To separate them, you might need specialized equipment like a centrifuge. But let's not get sidetracked.
The focus here is on hydrosols: 'hydro' signifies water, and 'sol' stands for solution. So, in essence, hydrosols are water solutions. They're milder than essential oils and can seamlessly blend into your skincare regimen. There you have it—hydrosols, demystified and ready for your beauty routine.