Bubble gum was invented by Walter Diemer in 1928. Diemer was working as an accountant for the Fleer Chewing Gum Company in Philadelphia. In his spare time, he experimented with new gum recipes. The gum he invented was less sticky than regular chewing gum, and stretched more easily. He sold his gum under the name Dubble Bubble in 1928. Original bubble gum was pink because that was the only dye Diemer had on hand at the time. However, he wanted to make it blue because that was his favorite color.