Invisible Ink is one of the bubble effects you can use in iMessage on iPhone, iPad, and even Mac running macOS Big Sur. This is perfect for creating suspense, building excitement, etc. When you send a message with Invisible Ink, it is not visible instantly. The recipient has to swipe on the message animation to reveal the content. It is pretty fun. 

You can see how to send an Invisible Ink message here: https://www.igeeksblog.com/send-invisible-ink-imessage-from-iphone-ipad/

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