cycles ink drop
A while ago Blender Diplom created an awesome tutorial on how to simulate an ink blob in blender using the smoke simulator. Unfortunately this tutorial uses the blender internal render.
I played a bit with the cycles smoke materials to recreate this in cycles. Here is my result not perfect but getting there
you can download the blend file here
See also:
smoke density selection
reverse smoke
dissolving smoke
purple smoke
Texture forcefield experiment 10 - smoke curl
reverse smoke
dissolving smoke
purple smoke
Texture forcefield experiment 10 - smoke curl