Abstract
The possibility for the force sensing by the change of the fingernail color was investigated. The fingernail color was classified into white an d red area. It was found that the fingernail color shows the high sensitivity to the applied force of 0N-5N. When the higher force was applied, the white area gradually increased and the change of density of a red color was observed. There are the sensitiv e change region of the binary analised data of white area at the force less than 5N. .
