The study provides an economical alternative for commercial extraction of anthocyanins from Sohiong fruit which can be used as a colourant for various food and other products and owing to its antioxidizing properties can be effective for the prevention and treatment of diseases.
TC: Would you ever make a colourant for men?
Notwithstanding its enormous price related to its rarity and colour, natural ultramarine was extensively used throughout history, as a decorative stone [1, 20], as a colourant for ceramics [21 23], and in paintings and manuscripts both in Asia and Europe starting from the 6th century [24], as well as in pre-Columbian cultures [25].
Due to the high chlorophyll content, pandan leaves are also a popular green colourant for food [ 13].
Selenium is widely used in the electronics industry, TV cameras, solar batteries, computer cores, rectifiers, xerographic plates and ceramics as a colourant for glass.
Some temporary colourants (lasting for six to eight washes and not covering grey) are PPD free, but virtually all semi-permanent and permanent colourants contain the ingredient.
This limitation may be overcome by combining surface-enhanced Raman spectroscopy (SERS) and fiber-optics reflectance spectroscopy in the visible (FORS) and by using a consistent database build up with historically accurate reproductions of references for colourants, binders and colour paints, which are the result of research into written sources of medieval techniques [13, 14, 17].
Food dyes are the most controversial but essential group of food additives as they are unavoidable colourants of foods, cosmetics and drugs for aesthetic reasons (Piccin et al. 2009; Wrolstad and Culver 2012).
Enhanced supplies of pure anthocyanins would service the demands of research to investigate these health-promoting effects and would also prove a valuable resource for the colourants and cosmetic industries to investigate the effects of chemical modifications, co-pigments, and pH on colour and stability for developing new plant sources of natural colourants, and new natural colours.
When both excitation and emission spectra sets were used, the distinction between lac dye and kermes was not possible due to the similarities in the emission spectra for these colourants, which is also seen in Fig. 2.
