Which famous consumer product was originally developed as a wallpaper cleaner in the 1930s before being repurposed for children's entertainment?

Some of the most significant innovations in history came after spectacular failures or were initially rejected by consumers. This trivia explores famous product discoveries and inventions that stumbled at first but ultimately transformed industries. Test your knowledge of these resilient products that overcame initial market rejection to become household names or that inspired future successes through their failures.

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Play-Doh
Silly Putty
Bubble Wrap
Slime