Invention Grant
US08921264B2 Thermochromic coloring pad 有权
热变色着色垫

Thermochromic coloring pad
Abstract:
A children's coloring pad may incorporate thermochromic pigments that are specially formulated to develop color and clear color by respective applications of cold and hot temperatures. The pad may be used in a similar manner as with respect to finger painting, but without the residual mess.
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