This document specifies the terms and definitions of the seed cotton Color Detector, the principle and composition of the instrument test, the product model, technical requirements, test methods, inspection rules and marks, Encasement, transportation and storage, which are applicable to the production and inspection of the photoelectric seed cotton Color Detector. Normative reference documents include the Encasement Storage and Transportation Encasement pictorial logo and the transportation Encasement receipt and delivery logo. The terms and definitions cover the seed cotton reflectance and the yellow depth of the seed cotton. The instrument test principle uses the white light beam of light measurement to reflect light. The composition includes Color detection components, microcomputers and detection software. Each part is responsible for different functions.