Relationship between Color Values of Paper Coated with Cobalt Chloride and Paddy Moisture Content

Abstract

This research is a study of the relationship between moisture content of paddy and the color changing of the cobalt chloride coated paper. The optimum during time was determined by soaking 100 pounds of paper in a solution of cobalt (II) chloride (CoCl2·6H2O) and methyl alcohol in ratio of 1: 4 ratio at 60 ° C for 3 and 4 hours, respectively. The paddy and paper coated with cobalt chloride were carried out in glass jar with head space 50% and closed the lid for a period of either 30 45 and 60 min. The results of the experiment to measure the color changing of cobalt chloride coated paper in paddy with moisture content was 10-24%w.b. showed that the paper color was slowly changed from blue to pink with an increase in the moisture content. The evaluation using the CIE color system found that the value of L * was slightly changed with an increase in the paddy moisture content, while the value of a * and b * values were changed clearly. Determination of paddy moisture content by measuring the relative humidity of the head space in the glass jar associated with the paddy moisture content was caused the relative humidity in the head space to change. From the experiment found that should keep paddy in a glass jar for at least 45 min, so it would be sufficient to allow the paddy moisture content to spread until the relative humidity in the head space was balanced.