Colour characterisation of natural anthocyanins was determined
on different pH values from 1 to 8. Pigment solutions were
prepared at pH 1–8 using potassium chloride buffer solution
(0.025 M) for pH values 1–4 and sodium acetate buffer solution
(0.4 M) for pH values 5–8. The mixtures were allowed to stand
for 1 h at room temperature before spectral measurement at wave