The time for ink mixing has arrived.

This message appears when it is time to mix the ink.

When Ink Mixing Notification accessed with Preferences - Notifications On/Off is on, this message appears when 24 hours elapse from the last time the ink was mixed.

Tap The time for ink mixing has arrived. to display the confirmation screen.

Remove just the ink cartridge for the white ink, shake it 50 times (about 20 seconds), and then reinsert this cartridge. On completion, tap Yes.