Ink, consist of "moving ink" and "color-change" effects

"moving ink"
Magician draw a dot on bottle and then drag it to any other location as he wish.

"color-change"
Magician write a prediction on bottle and then ask spectator to choose a card. Then magician shows prediction to Spector; at first, the prediction is wrong; magician then gives it a flick and change it into the correct one.