Ink in water. I did this with black paint and food colouring in water last year, but I used a large square glass vase which gave me major glare, reflection, shadow and air bubble issues.
It works better with the wine glass, even though there's still a bit of glare on either side from my lights.
*Thanks everyone for the comments, fav's & follows, in case I don't get around to responding to each one individually*
Based in Dublin, Ireland, started on...
