Fresh rosella or blue pea flower of 1 g was extracted in 100 ml of two different solvents at different temperatures
for 30 min. Solid residues were filtrated out to obtain clear dye solutions. A mixed dye was prepared by mixing rosella
solution to blue pea solution at a ratio of 1:1 by volume. The effect of extracting temperature was studied at 25, 50,
70 and 100 C, using water as an extracting solvent. The effect of extracting solvent was studied by a comparison of
dyes extracted in water and ethanol. The effect of pH of dye solution was studied by adjusting pH from the original
pH of 3.2 using 0.1 M HCl solution to four different pHs (0.5, 1.0, 2.0 and 3.0).