External monitor has pink tint.
For anyone experiencing a pink tint when using a 49" Samsung RG949CCAA (or other external monitor) connected to a 2018 MacBook Pro 13" (or other MBP) using a usb-c to HDMI connector. Try changing the HDMI Mode from 2.0 (default) to 1.4. To do this go into the your monitor's settings using the button on the monitor. Menu > System > HDMI Mode > (change to 1.4 from 2.0). This resolved my issue. Hope this helps someone.