Soap bubble for its soaps in 1886 using a painting by John Everett Millais of a child playing with bubbles. The Chicago company Chemtoy began selling bubble solution in the 1940s, and bubble solution has been popular with children ever since. According to one industry estimate, retailers sell around 200 million bottles annually. A bubble is made of transparent water enclosing transparent air. However the soap film is as thin as the visible light wavelength, resulting in interferences. This creates iridescence which, together with the bubble's spherical shape and fragility, contributes to its magical effect on children and adults alike. Each colour
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)