0.5 gram of mercuric bis-dithizonate having the following structural formula was dissolved in 1000 grams of dioctyl phthalate.



1550 grams of a high molecular weight polyvinyl chloride polymer, in powdered form, were dispersed in this solution by stirring for ten to fifteen minutes. The latter material was specifically Bakelite Company QYNV polymer. Thus a plastisol formulation containing the phototropic dye dissolved in the liquid dioctyl phthalate (plasticizer phase) was obtained. About 120 grams of this plastisol formulation were then poured into a two piece steel mold, this having its inner surface previously coated with a silicone oil release film. This was then placed in an oven at 140 degrees centigrade and held at this temperature for eight minutes to allow solution of the polyvinyl chloride polymer phase. The mold and contents were then removed from the oven, cooled to room temperature, and the now solid form of the doll figure removed.

The figure thus produced was transparent and red in color. Upon exposure to sunlight a progressive darkening to a brown, then blue-black color occurred during a period of about three to four minutes, simulating a “sunburning” effect. When the doll was shielded from the sun a return to the original color took place, being visually complete after a period of eight to ten minutes. This action was repeatable with no detectable change in functional characteristics being noted after several dozen cycles.