The ink pad (ink pad), is that of red inkpad used to when you press the stamp. It is kneaded ink pad and sponge ink pad to have been mainly used in modern Japan. Kneading ink pad is vermilion (sublimed mercury sulfide, plus the alkaline solution diluted concentration) and allowed such a mixed pigment is that hardened by kneading with castor oil. Since the time stamp imprint remains vivid even after, It is suitable to hanko the document to be saved over a long period of time. Generally for commercially available are those in inky and red synthetic resin and chemicals in pigment stamp ink pad. It has been a good ease of use at low cost.
Once the ink pad is used the mud has been started to use in order to press the hanko is that of China’s Song Dynasty. It called the Shirushidoro (Indei) that the ink pad is in China in modern times. In the Japan of the Edo era ink pad is used only for the samurai class was being allowed. It began to use the red, red is the color that indicates the amulet As used such as Torii shrine, is because it is considered to be good luck.