Importance

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Abstract

An article on which a message or a design appears when a certain temperature is reached is described. The article comprises a substrate, a first layer printed on said substrate using regular ink, and a second layer printed on said substrate or first layer using thermochromic ink. The substrate must be selected such that it is of a color which provides a visually discernable contrast between the substrate and the color of the first layer. Further, the hue and chroma of the first layer must be adjusted to the hue and chroma of the second layer in its cold state to ensure that the first layer is hidden. The method of making this article is also disclosed.

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First Claim