| 摘要 |
{PG,1 A unit set of multiple plies includes superimposed top, intermediate and bottom plies each being devoid of any tear lines which may form a stub, and each being coated on selected surfaces thereof with chemicals which are capable of reacting with one another to produce a colored mark. The top and bottom plies are interconnected by means of a removable glue flap, and portions of the glue extend through holes lying along a margin of the bottom ply so as to thereby interconnect the intermediate and bottom plies together. The top ply is coated front and back and the intermediate ply is coated on its back surface with a micro-encapsulated color precursor, while the bottom ply is coated front and back and the top surface of the intermediate ply is coated with a record-developing material. Upon application of pressure to the set, colored marks are formed on the intermediate and bottom ply top surfaces as the reactive components of the coatings on mating surfaces react. The plies are capable of rearrangement such that by removal of the intermediate ply and by placing the backs of the top and bottom plies in mating engagement {pg,2 colored marks are produced on the backs of the plies as the reactive components of the coatings of these mating surfaces are forced into reactive contact upon the application of pressure to the back of the set. |
