Posted in chemistry

Shiny colored bubbles

Shimmering with all the colors of the rainbow, bubbles are a joy to children young and old. For inventor Tim Kehoe, however, creating a bubble with a single color that won’t stain when it pops has been a 15-year, $3 million obsession. Two weeks ago, the world’s first colored, non-staining bubbles, Zubbles, went on sale.

A lot of people “said that you just can’t color a bubble,” said Kehoe, “which is discouraging when that is exactly what you are trying to do.”

The use of bubbles for entertainment purposes was first recorded about 400 years ago. Today, bubbles are arguably the world’s most popular toy, with more than 200 million bottles of bubble solution sold annually.

Zubbles, pictured here, are the worlds first non-staining, colored bubbles, which some toy manufacturers have called the holy grail of childrens toys.
Zubbles, pictured here, are the world's first non-staining, colored bubbles, which some toy manufacturers have called the "holy grail" of children's toys.
 The simple chemistry of bubbles — two layers of soap sandwiching a layer of water about a millionth of an inch thick — has foiled virtually every attempt to modify them. Bubbles that last a little longer or can be blown a little bigger have since been created, but adding color, what some toy manufactures have called the “holy grail” of toys, has remained frustratingly elusive.

Standard food coloring or dyes have no effect; they simply run down the sides of the bubble, creating a drop of color on the bottom. Other dyes can stain bubbles, but when they pop they also stain clothes, dogs and eyes, as Kehoe discovered during one accident. Other tests, including one for a bubble dye that washed out, didn’t fare much better.

“I thought a washable bubble was a great idea,” said Kehoe. “But the kids (of a large focus group) were covered head to toe in red dye. It looked like a scene from Braveheart.”

Eventually Kehoe and his colleagues found the three different classes of dyes that produce intense, vibrant and uniform colors. Originally, it took three days to produce what would eventually become Zubbles, but now it takes about 30 minutes.

Once a bubble pops, the dye fades in 15 minutes on virtually every material imaginable: concrete, leather, nylon, cotton and paint. Even easily stained material like silk remain unstained 15 minutes after a Zubble touches them.

Right now, consumers can only buy blue and pink bubbles, although Kehoe says that he can create bubbles of any color.

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Author:

Beth Kelley is a writer and researcher with an overall interest in how people engage with and are impacted by their environments and vice versa. This has manifested itself in many ways, by looking at creativity, playful spaces and environmental enrichment, sustainability, design research, and integrative and collaborative models of learning such as through play and hands-on learning.