Abstract:
This research investigated lake preparation from teak (Tectona glandis) leave extract. The color extracts from young and mature of the teak leaves were prepared by using water, 50% ethanol and 95% ethanol in water. Young teak leave extract from 50% ethanol provided the most bright orange-red color with L*=18.85±0.66, a*=9.91±0.27 and b* =2.93±0.09. Pigment from 50%ethanolic young teak leave extract was prepared by using aluminum chloride, aluminum oxide, aluminum potassium sulfate and magnesium aluminum silicate yielding 2.87%, 90.96%, 4.19% and 84.27% w/w, respectively. From lake appearance consideration, the aluminum potassium sulfate was selected for study the effects of salt amount, extract to salt ratio, reaction time, temperature, and pH during pigment preparation. Suitable ratio of the color extract solution to the salt solution was 2:1 v/v. Pigment preparation reaction at 60 min, pH 3-4 and 95oC was also the suitable condition. The prepared teak leave pigment was bleeding stable in DI water. After 6 cycles of heating-cooling acceleration test, the pigment also exhibited its color stability.