The History and Science of Play-Doh

TLDR Play-Doh was originally created as a wallpaper cleaner but later became a popular toy. It is made from a combination of starch and water, and while it can dry out over time, it can be rehydrated and has a variety of uses.

Timestamped Summary

00:00 Play-Doh is a topic that the hosts of the podcast will be discussing in this episode.
04:19 Play-Doh was originally created as a wallpaper cleaner, but was later turned into a toy after Joe McVickers' sister-in-law suggested it.
09:04 Play-Doh was featured on Captain Kangaroo and became popular after he mentioned it on his show multiple times a week.
13:36 Play-Doh is not meant to be cured like modeling clay, but rather for making fun things in the moment and then smashing them and putting them back in the can.
17:57 Play-Doh has sold 950 million pounds of their product since 1956, and they continue to increase production by 5 million cans per year, with a variety of licensing deals and different types of Play-Doh available.
22:37 The basis of Play-Doh is an interaction between starch and water, specifically amyloses and amylopectin, which form a starburst-shaped molecule held together by hydrogen bonds, and when warm water is added, it gelatinizes to create the Play-Doh texture, but the problem is that as it dries, retrogradation occurs and the excess amylose separates from the water, causing the compound to break down.
27:08 The recipe for Play-Doh had to be carefully balanced to create a firm, yet pliable texture, and the addition of a lubricant and surfactant were necessary to prevent stickiness and bind the compound together.
31:14 A surfactant is added to Play-Doh to bind the water and fats together, preventing separation, and if Play-Doh dries out, it can be rehydrated by wrapping it in a damp paper towel and leaving it overnight.
35:24 Play-Doh has a shelf life and can become hard like a brick if it's too old, but there are recipes available online to make homemade Play-Doh using ingredients like starch and cream of tartar.
39:39 There are banned Play-Doh ads that were published in Singapore that are violent and a little dark, but they are pretty great.
44:18 The hosts discuss their opinions on the movie "Oblivion" and mention that they enjoy talking about movies in general.
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