How to Determine Coating Color?

The colorimetric method is usually used to measure the color of paint, that is, observe the paint product without pigment and a series of solutions of standard color scale under natural scattered light or the transmitted light of a fixed artificial light source, and compare the color difference. depth.

The color measurement generally adopts an iron-cobalt Colorimeter, which is composed of ferric iron, 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 of a certain number. The color of the solution was used as the color of the sample. The iron-cobalt Colorimeter should be calibrated once a year.

A residual liquid Colorimeter can also be used. It consists of a series of standard color scale solutions containing different amounts of phosphorus in aqueous solution of potassium iodide. The iodine solution Colorimeter has a short useful life and is inconvenient to store, so it is not as common as the iron-cobalt Colorimeter.

The color of the product after adding the pigment is generally determined by comparison with a standard Color Chart. In recent years, photoelectric Colorimeters have been used to measure the color, and the values ​​can be read directly, and the color difference can be obtained through formula calculation. This avoids human error in visual inspection.