Analysis of information sources in references of the Wikipedia article "Maraschino cherry" in English language version.
In 1925, Wiegand discovered that adding calcium salts to the preserving brine firmed up the fruit.
... Red Dye No. 40, the same dye used in the maraschino cherry juice.
There are limits beyond which the processors of maraschino cherries may not go, the United States Food and Drug Administration has decided. ...