Reveal substrate and methods of using the same

A reveal substrate comprising:

• a) a top substrate layer
• comprising an opaque polymer sensitive to application of heat or pressure, said opaque polymer becoming transparent upon being heated to a predetermined temperature or subjected to a predetermined pressure, and
• b) a bottom substrate layer
• having one or more colored areas on a top surface thereof, said bottom substrate layer being disposed in a manner such that said one or more colored areas are obscured by the opaque polymer prior to being heated to the predetermined temperature or subjected to the predetermined pressure, and are revealed subsequent thereto,
• wherein:
• each of the one or more colored areas comprises at least two different colors, and
• each of the one or more colored areas comprises a two-dimensional matrix formed by a plurality of color blocks, each one of the plurality of color blocks having only one of the at least two different colors, and
• the plurality of color blocks are arranged to have a repeating color pattern, and
• the plurality of color blocks overlap, forming overlapped areas which comprise a color formed from merging adjacent colors.