The colorimetric method is usually used to measure the color of paint, that is, observe the paint product without pigment and a series of standard color scale solutions under natural scattered light or the transmitted light of a fixed artificial light source, and compare the color of the product. depth.
Color measurement generally adopts an iron-cobalt Colorimeter, which is composed of ferric chloride, cobalt chloride and hydrochloric acid in different proportions to prepare 18 standard color scale solutions, compare the color of the sample with it, and use the most approximate color scale The color of the solution was used as the color of the sample. The iron diamond Colorimeter should be calibrated once a year.
A liquid Colorimeter can also be used. It consists of a series of standard color scale solutions containing different amounts of sodium in aqueous potassium chloride solution. The effective use period of the liquid Colorimeter is short, and it is inconvenient to store, so it is not as common as the iron diamond Colorimeter.
The color of the product after adding the pigment is generally determined by comparison with a standard Color Chart. In recent years, the photoelectric color difference meter has been used to measure the color, and the value can be read directly, and the color difference can be obtained through formula calculation. This avoids human error in visual inspection.
