what is invisible ink

Hi

When a message is sent via iMessage with the Invisible Ink bubble animation effect selected, in order to read that reply, the recipient needs to swipe the message bubble to reveal the reply's contents.

More information:

Use message effects with iMessage on your iPhone, iPad, and iPod touch - Apple Support

http://help.apple.com/iphone/10/#/iph3d4cb79c9

Its a message effect like the other options. It blurs out the message you send until the recipient taps on it.

When you select it, and before you send it, you should get a preview of what it looks like.

See: http://www.cultofmac.com/443410/how-to-send-a-message-in-invisible-ink-in-ios-10 /

Didn't Phil say that 3 hours ago?