[nopardons]

Glycerine INSTEAD of real tears; however, it wasn't used all that often; actresses, back then, COULD cry on cue.

Margaret O'Brien was a great child star ( she could REALLY act! ) and she was very valued because she COULD and DID cry easily on cue; for but one example.

[frank ballenger]

I think the best cry on cue actress is Missy Peregrym on the current FBI. Many scenes don’t cut away as she starts bawling.

https://tenor.com/view/fbi-missy-peregrym-sad-cry-gif-16496300

https://www.google.com/search?q=missy+peregrym+crying&sca_esv=54f9445f3c681e70&sca_upv=1&udm=2&biw=1196&bih=548&ei=al0cZoPeGKz9ptQPhMuw4Ak&ved=0ahUKEwiDu6OD5cKFAxWsvokEHYQlDJwQ4dUDCBA&oq=missy+peregrym+crying&gs_lp=Egxnd3Mtd2l6LXNlcnAiFW1pc3N5IHBlcmVn