Determination of Solid and Paste Color Values by Rovipen Chromatometer

(I. Overview

The combination of Lovibond Color Meter I (, yobiand, clnteer), filter photometer (Pll7erPhotome7.r) and Spectrophotometer (SPe, oPhoto, Jiangpaito) produced by the British Lovibond Color Meter Company The principles are different. It uses the transmission and reflection of light. According to the principle of the three primary colors①, use different shades of red, yellow, and blue primary color filter slides to match the measured sample, and read the three primary colors. Value, that is to say, any color of the sample to be tested can be decomposed by the Lovibond color meter to obtain the red, yellow and blue values ​​representing the sample. The characteristics of this instrument are not only used for the color value of transparent liquids that can transmit light, such as oils, beverages, etc., but also for opaque solid powder or pasty items such as wheat flour, Chaoshou skin (called wonton in the north and Jiangsu and Zhejiang) through the reflection of light. In Guangdong and Hainan, it is called wonton skin), noodles, cloth, cotton yarn, paper, plastic, pigment, paste, etc. can be filled into solid powder boxes or paste storage boxes to measure the surface color value; there is also a The rotating box can be used to fix uneven color or granular samples such as tobacco, peas, wheat grains, candies, hard nuts, etc., and the rotating box will display a uniform color, and then measure the Lovibond value. In the international market, it has been widely used to determine the Lovibond color value of various commodities. In the past 40 years in our country, it was only used to measure the color value of vegetable oil ④ and failed to fully realize the potential energy efficiency of this instrument. Recently, we are exploring the process quality control in the process of small grinding sesame oil processing, to ensure the aroma of the finished product by measuring the color of the sesame oil paste after frying the seeds and grinding it into a paste. The determination of the whiteness of flour and its products such as fresh noodles and Chaoshou skin (wonton skin, wonton skin) can also be said to be a typical example of the use of Lovibond color meter to measure the color value of solid and paste, and has obvious results.