This video shows you how to use the iPhone's built in iMessage to send an invisible ink message to another iPhone user using a hidden function of the built-in iMessage. I discovered how to do it by accident.
- Open iMessage
- Type your message
- Press down HARD on the send button
- A menu will pop up with five special effects options, "Screen", "Slam", "Loud", "Gentle", and "Invisible Ink"
Select the dot next to "invisible ink", and click "Send"
And that's not all. The new menu leads you to loads of new features. See some examples below: