Soap bubble into college years. A Swiss university professor, Dr. Natalie Hartzell, has theorized that usage of artificial bubbles for entertainment purposes of young children has shown a positive effect in the region of the child's brain that controls motor skills and is responsible for coordination with children exposed to bubbles at a young age showing measurably better motion skills than those who were not. Soap bubbles have been used as entertainment for at least 400 years, as evidenced by 17th-century Flemish paintings showing children blowing bubbles with clay pipes. The London-based firm A. & F. Pears created a famous advertising campaign
Pears (soap) could evaporate and be re-used. The soap bars were laid out on wooden trays in drying rooms known as "ovens" about the size of a domestic garage. Bars were placed on trays with both sides open to the air. Ovens were graded in warmth from around 70F (21C) to 100F (39C). As drying proceeded trolleys loaded with trays were moved to progressively warmer ovens. In practice the soap often became opaque. Unilever explored options to prevent this, all of which would have added to the cost: On February 27, 2003, the 7th Amendment to the EU Cosmetics Directive (Directive 2003/15/EC)