How Play-Doh Was Invented

The original 1965 patent for the soft, non-toxic modeling compound known as Play-Doh, detailing a specific mixture of flour, water, salt, and kerosene.

What it covers

The patent defines a specific chemical mixture that creates a soft, pliable, and non-sticky modeling clay. The composition relies on a precise ratio of grain flour, water, a water-soluble inorganic chlorine salt, and a small amount of kerosene. This combination allows the material to remain lump-free and re-workable over long periods without drying out or becoming toxic to children. By balancing these ingredients, the inventors created a substance that holds its shape when molded but remains soft enough for easy manipulation.

What it doesn't cover

• —Does not cover modeling compounds that exclude the specific range of kerosene as a lubricant.
• —Does not cover clay-based modeling materials that do not use grain flour as the primary base.
• —Does not cover mixtures that omit the water-soluble inorganic chlorine salt.

The clever bit

The inclusion of kerosene acts as a subtle lubricant and preservative, preventing the flour-and-water mixture from becoming sticky or developing mold while maintaining a velvety texture.

Why it matters

This patent protected the formula for Play-Doh, which became one of the most successful children's toys in history. It transformed a product originally intended for cleaning wallpaper into a global cultural staple for creative play.

Real-world examples

• 1.Play-Doh modeling compound