Abstract: In one embodiment of the invention, photo-chromic and phosphorescent toys are disclosed. A photo-chromic and phosphorescent toy includes both photo-chromic and phosphorescent materials applied to the toy such as through an ink, paint, plastic, or dye. The photo-chromic and phosphorescent materials may be supplied within a material of the toy or applied-to a surface of the toy at the factory. The photo-chromic and phosphorescent materials may be activated in various ways with various light activating devices that can generate an activating light with appropriate wavelengths.

Abstract: In one embodiment of the invention, photo-chromic applicators are disclosed. The photo-chromic applicator may include a liquid photo-chromic material such as a photo-chromic ink or paint. The photo-chromic material is applied to a surface of a toy, a page, or other object by a child user. The photo-chromic material may be activated in various ways with various light activating devices that can generate the activating light with appropriate wavelengths.

Abstract: In one embodiment of the invention, photo-chromic light drawing sets are disclosed including a photo-chromic page and a light pen. The photo-chromic page includes a flat transparent substrate having a page-like shape and one or more layers of photo-chromic ink applied onto the substrate. The flat transparent substrate to display an object underneath, and the one of more layers of photo-chromic ink are substantially transparent in an inactive state. The light pen selectively generates an activating light to shine onto the photo-chromic page and activate a portion of the one of more layers of photo-chromic ink. The activated portion of the one or more layers of photo-chromic ink is temporarily transformed from the inactive state to an active state in response to the activating light.

Abstract: In one embodiment of the invention, photo-chromic toys are disclosed. A photo-chromic toy includes a photo-chromic material such as a photo-chromic ink, paint, plastic, or dye. The photo-chromic material may be supplied in a material of the toy or applied to a surface of the toy at the factory. The photo-chromic material may be activated in various ways with various light activating devices that can generate the activating light with appropriate wavelengths.

Abstract: In one embodiment of the invention, photo-chromic doll playsets are disclosed. A photo-chromic doll playset includes a doll having a substrate; a photo-chromic material applied to the substrate; a light pen to selectively apply a tightly focused activating light output on the photo-chromic material to create narrow lines of activated photo-chromic material. In response to the activating light, the activated photo-chromic material temporarily transforms from a first color to a second color for a period of time before gradually decaying back to the first color.

Abstract: In one embodiment of the invention, a doubled ended light pen for photo-chromic toys is disclosed. A doubled ended light pen includes a housing having a first end and a second end, a first ultraviolet light emitting diode (UVLED) mounted near the first end of the housing, a second UVLED mounted near the second end of the housing, and first and second switches mounted in the housing. The housing holds one or more batteries to provide power. The first switch and the second switch respectively switch ON and OFF the power supplied by the one or more batteries to the first UVLED and the second UVLED. When powered on, the first UVLED applies a wide angle activation light while the second UVLED applies a point source activation light to a photo-chromic surface.