Annette Foglino, of the Smithsonian.com, looks at the history of the Sweetheart Candies. Did you know the candies were originally popular at weddings and were considerably larger than today's hearts?
[The candies] could accommodate wordy relationship advice such as "Married in White, you have chosen right" or "Married in Pink, he'll take to drink." By the early 1900s the shape of the candy had changed from shells, baseballs and horseshoes to hearts. As the little hearts grew in popularity, the missives grew shorter: "Miss You," "Love U."
There's also a Sweetheart candy message generator.
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