It is a patent number developed by Qiu Tianying of Yingtao Freckle Removal Research Institute: ZL 2010 2 0135712.1. The application date is October 27, 2010. It only takes about a week to remove freckles. First apply their unique facial mask and then use a pigment extraction stick. Isn’t it amazing that after 5 days of peeling off the mask, the spots are gone? But this is what I saw with my own eyes