The acidity of the bleached syrup was also demonstrated that effect to colour development of syrup. The results showed that the higher acidity, the lower the colour index. However, the average increase of colour of the syrup stored at pH 5.2 from the initial hour to the final hour is approximately 24%. Whereas that for the syrup which has the highest pH value was 14%. The significantly increasing in colour index during
stored the syrup would greatly affect the colour of sugar products. The results also showed that the colour index at final hour of syrup stored at pH 5.2 is not significalty different from of syrup stored at pH 5.6 and 6.0. In addition, the sucrose will be converted to fructose and glucose in high acidity medium effect to the factory recovery. Therefore, the pH value should be control at a suitable value (pH ~ 6.0) and also keep stable during storage time. Hence, the sugarcane factories may think of closed tanks which are air-free, and also use good material for preventing to expose iron to clarified syrup. PVC tanks are recommended in this case which are free from annual maintenance and are more durable.